Nevus Flammeus

Nevus flammeus, commonly known as a “port-wine stain,” is a type of birthmark that appears on the skin due to abnormal blood vessel development. This article aims to provide an in-depth explanation of Nevus flammeus, its causes, symptoms, treatment options, and available resources. Nevus flammeus is a congenital vascular birthmark that occurs when the capillaries in a specific area of the skin are dilated and overfilled with blood. This results in a pink, red, or purple mark, usually present at birth or appearing shortly thereafter. The name “port-wine stain” reflects the mark’s resemblance to spilled port wine. The exact cause of Nevus flammeus is not yet fully understood. However, it is believed to be a result of abnormal blood vessel development during embryonic growth. This condition is not hereditary in most cases and occurs randomly.


Types of Nevus Flammeus:

  1. Superficial Nevus Flammeus: The superficial nevus flammeus is the most common type, characterized by its distinct pink or red coloration. It affects the top layer of the skin, known as the epidermis. This type of birthmark may vary in size and shape, ranging from small patches to large, irregular areas. Superficial nevi flammei can occur on any part of the body and are often visible at birth or shortly thereafter.
  2. Deep Nevus Flammeus: Deep nevus flammeus, as the name suggests, affects deeper layers of the skin, such as the dermis or subcutaneous tissue. This type of birthmark appears darker in color and may have a raised or bumpy texture. Deep nevi flammei are typically larger and more extensive than superficial ones, often covering a significant portion of the affected area.
  3. Mixed Nevus Flammeus: Mixed nevus flammeus refers to a combination of both superficial and deep components. It exhibits characteristics of both types, displaying a pink or reddish coloration along with raised or bumpy areas. Mixed nevi flammei can be challenging to treat due to the involvement of multiple layers of the skin.


It is caused by an abnormality in the blood vessels,

  1. Genetic Factors: Nevus flammeus can be caused by genetic mutations or inherited conditions that affect the development of blood vessels.
  2. Somatic Mosaicism: This occurs when there is a genetic change in a specific group of cells during early development, leading to the presence of a port-wine stain.
  3. Somatic Mutation: Somatic mutations are spontaneous genetic changes that occur after conception, resulting in the formation of a birthmark.
  4. RASA1 Gene Mutation: Mutations in the RASA1 gene, responsible for regulating blood vessel formation, can lead to the development of Nevus flammeus.
  5. GNAQ Gene Mutation: Alterations in the GNAQ gene can cause an overgrowth of blood vessels, resulting in the characteristic birthmark.
  6. Sturge-Weber Syndrome: This rare condition, caused by a somatic mutation in the GNAQ gene, is often associated with the presence of a port-wine stain.
  7. Klippel-Trenaunay Syndrome: A congenital disorder affecting blood vessels, bones, and soft tissues, which can cause Nevus flammeus as a symptom.
  8. Parkes Weber Syndrome: Another vascular disorder that causes abnormal blood vessel growth, potentially leading to the development of port-wine stains.
  9. Proteus Syndrome: This rare genetic disorder results in the overgrowth of tissues and can be associated with the presence of a birthmark.
  10. Neurofibromatosis: Certain forms of neurofibromatosis, such as type 1, can be linked to the development of Nevus flammeus.
  11. Capillary Malformations: Structural abnormalities in the capillaries can cause a port-wine stain to form.
  12. Arteriovenous Malformations: Abnormal connections between arteries and veins can result in the appearance of a port-wine stain.
  13. Hormonal Changes: Hormonal imbalances, such as those occurring during puberty or pregnancy, may contribute to the formation of a birthmark.
  14. Trauma or Injury: Physical trauma or injury to the skin can lead to the development of a port-wine stain.
  15. Sun Exposure: Prolonged exposure to sunlight without adequate protection can worsen the appearance of Nevus flammeus.
  16. Drug Reactions: Certain medications or treatments may trigger the formation of port-wine stains as a side effect.
  17. Fetal Alcohol Syndrome: Exposure to alcohol during pregnancy can increase the risk of developing a port-wine stain in the baby.
  18. Chromosomal Abnormalities: Certain chromosomal abnormalities, such as Turner syndrome or Down syndrome, can be associated with the presence of a birthmark.
  19. Radiation Exposure: Exposure to radiation, either during medical procedures or environmental factors, may contribute to the development of a port-wine stain.
  20. Maternal Age: Advanced maternal age has been suggested as a possible risk factor for the occurrence of Nevus flammeus in infants.
  21. Infections: Some viral or bacterial infections during pregnancy or early childhood have been linked to the development of port-wine stains.


Common symptoms of Nevus flammeus

  1. Discolored Patches: One of the primary symptoms of Nevus flammeus is the presence of discolored patches on the skin. These patches are typically pink, red, or purple in color and can vary in size and shape.
  2. Facial Involvement: Nevus flammeus commonly affects the face, particularly on one side. The birthmark may cover a small or large area, such as the forehead, eyelids, nose, cheeks, or chin.
  3. Irregular Border: The border of a Nevus flammeus birthmark may appear irregular or have a ragged edge. This characteristic can distinguish it from other types of birthmarks.
  4. Persistence: Unlike some birthmarks that fade over time, Nevus flammeus tends to persist and may become more noticeable as a person grows older. The color intensity may deepen or darken over time.
  5. Size Variation: Nevus flammeus can vary greatly in size. Some individuals may have small, localized birthmarks, while others may have larger, more extensive areas of involvement.
  6. Increased Blood Flow: The affected area may show signs of increased blood flow, resulting in a warm or flushed appearance. This symptom can become more prominent when the person is exposed to heat or experiences strong emotions.
  7. Thickening of the Skin: In some cases, Nevus flammeus can cause the skin to thicken over time. This symptom may lead to a bumpy or textured appearance.
  8. Blistering or Ulceration: Rarely, Nevus flammeus can develop blisters or ulcers. These complications may occur due to trauma or prolonged pressure on the affected area.
  9. Pain or Sensitivity: While not common, some individuals with Nevus flammeus may experience pain or sensitivity in the affected area. This symptom can occur due to nerve involvement.
  10. Associated Eye Abnormalities: Nevus flammeus located near the eye area may be associated with various eye abnormalities, such as glaucoma, strabismus (crossed eyes), or increased risk of developing a type of tumor called choroidal melanoma.
  11. Associated Syndromes: In rare cases, Nevus flammeus may be associated with certain syndromes, such as Sturge-Weber syndrome or Klippel-Trenaunay syndrome. These syndromes involve additional symptoms and may require specialized medical management.
  12. Increased Hair Growth: Hair growth within or around the Nevus flammeus birthmark may be more pronounced than in surrounding areas. This symptom is more common in older children and adults.
  13. Swelling or Thickened Tissue: In some instances, Nevus flammeus can cause swelling or thickened tissue in the affected area. This symptom may contribute to functional limitations, particularly if it affects the eyes, mouth, or airway.
  14. Associated Neurological Symptoms: Nevus flammeus located on the head or neck may be accompanied by neurological symptoms. These can include seizures, developmental delays, intellectual disabilities, or migraines.
  15. Emotional Impact: Living with a visible birthmark like Nevus flammeus can have emotional and psychological implications.


Early diagnosis is crucial for effective treatment and management.

  1. Visual Examination: Visual examination by a dermatologist is the primary diagnostic tool. The doctor carefully inspects the affected area for the distinctive pink or red birthmark, which may vary in size, shape, and location.
  2. Medical History Assessment: A comprehensive review of the patient’s medical history helps determine if there is a family history of Nevus flammeus or any associated conditions. This information aids in understanding potential risk factors and treatment approaches.
  3. Physical Examination: The dermatologist conducts a thorough physical examination, checking for any additional symptoms, such as changes in skin texture or thickness, and evaluating the extent of the birthmark’s involvement.
  4. Wood’s Lamp Examination: A Wood’s lamp, which emits ultraviolet light, can help identify certain characteristics of the Nevus flammeus birthmark. It reveals the depth of the pigmentation and assists in differentiating it from other skin conditions.
  5. Doppler Ultrasound: A Doppler ultrasound assesses blood flow within the affected area, providing valuable insights into the vascularity of the birthmark and any associated vascular anomalies.
  6. Biopsy: In rare cases where the diagnosis is uncertain or when there are atypical features, a small tissue sample, or biopsy, may be taken for microscopic examination. This helps rule out other potential skin conditions or associated syndromes.
  7. Magnetic Resonance Imaging (MRI): An MRI scan is recommended when deeper structures are involved or when there is a concern about associated abnormalities, such as vascular malformations affecting the brain or internal organs.
  8. Genetic Testing: Genetic testing is performed to identify any underlying genetic mutations associated with Nevus flammeus. This test is particularly relevant if there is a suspected genetic syndrome or a family history of similar conditions.
  9. Ophthalmologic Evaluation: An ophthalmologist evaluates individuals with facial port-wine stains to assess for ocular complications, such as glaucoma or abnormalities of the eyelids, cornea, or retina.
  10. Neurological Assessment: A neurological assessment is crucial, especially in cases where the birthmark involves the forehead or scalp, as it helps detect any underlying brain abnormalities, such as Sturge-Weber syndrome.
  11. Laser Doppler Imaging (LDI): LDI is a non-invasive imaging technique that maps blood flow in the skin. It assists in determining the vascular patterns of Nevus flammeus and monitoring treatment response.
  12. Thermography: Thermography uses infrared imaging to detect variations in skin temperature caused by underlying vascular malformations. It aids in evaluating the extent and severity of the condition.
  13. Fluorescein Angiography: Fluorescein angiography involves injecting a fluorescent dye into the bloodstream and taking images to assess the blood vessels’ structure and any abnormalities in the affected area.
  14. Optical Coherence Tomography (OCT): OCT is a non-invasive imaging technique that provides high-resolution cross-sectional images of the skin and underlying structures. It aids in assessing the depth and extent of the port-wine stain.
  15. Electroencephalogram (EEG): EEG measures the electrical activity of the brain. It is recommended in certain cases to evaluate for underlying brain abnormalities associated with Nevus flammeus.
  16. Echocardiogram: An echocardiogram is performed to assess the heart’s structure and function, particularly when there is a suspicion of an associated cardiac anomaly, as seen in certain syndromes.
  17. Renal Ultrasound: Renal ultrasound is used to evaluate the kidneys for any structural abnormalities, which may be associated with certain genetic syndromes.
  18. Abdominal Ultrasound: Abdominal ultrasound is performed to assess the abdominal organs for any potential abnormalities associated with underlying syndromes or conditions.
  19. X-ray: X-ray imaging may be employed in certain cases to evaluate the bony structures beneath the port-wine stain, particularly when there are concerns about skeletal abnormalities.
  20. CT Scan: A computed tomography (CT) scan provides detailed cross-sectional images of the head and body, aiding in the evaluation of any underlying structural abnormalities or associated conditions.
  21. Electrocardiogram (ECG): An electrocardiogram records the electrical activity of the heart and helps assess cardiac function, particularly if there are concerns about associated heart abnormalities.
  22. Blood Tests: Blood tests may be conducted to assess general health, check for any associated conditions, or monitor the effectiveness of treatment approaches.
  23. Urine Tests: Urine tests help evaluate kidney function and screen for any associated renal abnormalities.
  24. Hormone Level Assessment: In cases where there is a suspicion of hormonal imbalances associated with certain syndromes, hormone level assessment may be performed.
  25. Eye Examination: A comprehensive eye examination is crucial for individuals with facial port-wine stains, helping detect any ocular abnormalities and monitoring visual health.
  26. Skin Biopsy: A skin biopsy may be performed to analyze the composition and structure of the affected skin and rule out other skin conditions that can resemble Nevus flammeus.
  27. Immunohistochemistry: Immunohistochemistry is a specialized staining technique used to identify specific proteins in the skin sample obtained through a biopsy. It can provide additional insights into the cellular characteristics of the birthmark.
  28. Vascular Imaging: Advanced vascular imaging techniques, such as angiography or venography, may be used to assess the blood vessels’ structure and determine the extent of the vascular involvement.
  29. Photography: Photographic documentation of the Nevus flammeus birthmark is essential for monitoring its progression and evaluating treatment outcomes over time.
  30. Psychological Assessment: Psychological assessments may be conducted to evaluate the emotional impact of the birthmark on the individual, provide support, and explore coping mechanisms.


Effective treatments for nevus flammeus to help individuals understand their options for managing this condition.

  1. Laser Therapy: Laser therapy is one of the most common treatments for nevus flammeus. It involves the use of specific wavelengths of light to target and destroy the blood vessels responsible for the birthmark. Multiple sessions may be required for optimal results.
  2. Pulsed Dye Laser (PDL): PDL is a type of laser therapy that delivers short bursts of high-intensity light. This treatment selectively targets the blood vessels, minimizing damage to surrounding tissues. PDL is particularly effective in lightening or fading port-wine stains.
  3. Intense Pulsed Light (IPL) Therapy: IPL therapy uses a broad spectrum of light to target and treat nevus flammeus. This non-invasive treatment can help reduce the appearance of birthmarks by targeting the blood vessels responsible for their formation.
  4. Cryotherapy: Cryotherapy involves freezing the affected area with liquid nitrogen. This treatment helps destroy the blood vessels, causing the birthmark to fade gradually over time.
  5. Surgical Excision: In some cases, surgical excision may be recommended to remove the port-wine stain. This procedure involves cutting out the affected tissue and then closing the wound with stitches. Surgical excision is often performed for smaller birthmarks or in combination with other treatments.
  6. Dermabrasion: Dermabrasion is a technique that involves the removal of the top layers of the skin using a rotating brush or diamond wheel. This treatment can help reduce the appearance of nevus flammeus by promoting the growth of new, healthier skin.
  7. Microdermabrasion: Similar to dermabrasion, microdermabrasion exfoliates the skin using fine crystals or a diamond-tipped wand. This procedure is less aggressive than dermabrasion and is effective in reducing the visibility of superficial port-wine stains.
  8. Topical Steroids: Topical steroids, such as corticosteroid creams or ointments, can be applied to the birthmark to reduce inflammation and improve its appearance. This treatment option is often used in combination with other therapies.
  9. Camouflage Makeup: Camouflage makeup is a temporary solution for concealing nevus flammeus. Specially formulated cosmetics can help even out skin tone and minimize the visibility of the birthmark.
  10. Vascular Laser Therapy: Vascular laser therapy targets the blood vessels within the birthmark, causing them to shrink and fade. This treatment is particularly effective for smaller port-wine stains.
  11. Pulsed Radiofrequency Therapy: Pulsed radiofrequency therapy involves the application of high-frequency electrical pulses to the affected area. This treatment can help reduce the size and color intensity of the birthmark.
  12. Photodynamic Therapy (PDT): PDT utilizes a photosensitizing agent and a specific wavelength of light to selectively destroy the blood vessels associated with nevus flammeus. This treatment option is still being researched but shows promise in reducing the appearance of birthmarks.
  13. Steroid Injections: Steroid injections can be administered directly into the birthmark to reduce its size and color intensity. This treatment is commonly used in combination with other therapies for more significant results.
  14. Sodium Tetradecyl Sulfate (STS) Injections: STS injections involve injecting a sclerosing agent directly into the blood vessels of the birthmark. This causes the vessels to shrink and eventually disappear over time.
  15. Tattooing: Tattooing the birthmark with a flesh-colored pigment can help camouflage the nevus flammeus. This technique is often used for smaller, less prominent birthmarks.
  16. Electrocautery: Electrocautery involves using a small electric current to destroy the blood vessels within the birthmark. This treatment option is usually suitable for smaller port-wine stains.
  17. Steroid Creams: Topical steroid creams can be applied to the affected area to help reduce inflammation and lighten the color of the birthmark.
  18. Salicylic Acid: Salicylic acid can be used in combination with other treatments to exfoliate the skin and promote the fading of the port-wine stain.
  19. Chemical Peels: Chemical peels involve applying a chemical solution to the skin to remove the top layers, revealing new skin underneath. This treatment can help lighten the appearance of nevus flammeus.
  20. Silicone Gel Sheets: Silicone gel sheets can be applied to the birthmark to flatten and soften the skin. This treatment option is often used after laser therapy or surgical excision.
  21. Vascular Embolization: Vascular embolization is a minimally invasive procedure that involves blocking the blood vessels supplying the birthmark. This treatment can help reduce the size and color intensity of the nevus flammeus.
  22. Stereotactic Radiosurgery: Stereotactic radiosurgery delivers focused radiation beams to the birthmark, targeting the blood vessels and causing them to shrink. This treatment option is typically used for larger or deeper port-wine stains.
  23. Laser-assisted Drug Delivery: This innovative technique combines laser therapy with the application of topical medications. The laser helps to enhance the penetration of the medication into the birthmark, leading to improved results.
  24. Herbal Remedies: Certain herbal remedies, such as green tea extract or aloe vera, are believed to have anti-inflammatory properties and may help reduce the appearance of nevus flammeus. However, their effectiveness varies, and more research is needed.
  25. Platelet-Rich Plasma (PRP) Therapy: PRP therapy involves injecting platelet-rich plasma derived from the patient’s own blood into the birthmark. This treatment promotes healing and regeneration of the skin, potentially leading to reduced visibility of the port-wine stain.
  26. Scar Revision Techniques: Scar revision techniques, such as surgical excision, laser therapy, or dermabrasion, can be used to improve the appearance of the birthmark and reduce scarring.
  27. Hyaluronic Acid Fillers: Hyaluronic acid fillers can be injected into the birthmark to help even out the skin’s texture and reduce the appearance of nevus flammeus.
  28. Radiofrequency Ablation: Radiofrequency ablation involves using high-frequency electrical currents to heat and destroy the blood vessels within the birthmark. This treatment option is still being explored but shows promise in reducing the appearance of port-wine stains.
  29. Combination Therapy: Combining different treatment modalities, such as laser therapy with topical medications or surgical excision with laser therapy, can often yield better results in managing nevus flammeus.
  30. Psychological Support: While not a direct treatment for the birthmark itself, psychological support and counseling can be crucial in helping individuals cope with the emotional and social challenges associated with nevus flammeus.


Effective drug treatments for nevus flammeus, their mechanisms of action, and potential side effects.

  1. Topical Corticosteroids: Topical corticosteroids, such as hydrocortisone cream, are commonly used to reduce inflammation and redness associated with nevus flammeus. These creams work by suppressing the immune response and decreasing blood vessel dilation.
  2. Topical Retinoids: Retinoids, derived from vitamin A, can help improve the texture and color of port-wine stains. Topical retinoids promote cell turnover, which can gradually fade the birthmark over time.
  3. Topical Tacrolimus: Tacrolimus ointment is an immunosuppressive medication that inhibits the activity of immune cells involved in inflammation. It can be applied topically to nevus flammeus to reduce redness and size.
  4. Topical Timolol: Timolol is a beta-blocker that can be applied topically to port-wine stains. It works by constricting blood vessels, thereby reducing the intensity of the birthmark.
  5. Oral Propranolol: Propranolol, an oral beta-blocker, has shown promising results in fading nevus flammeus. It works by regulating blood flow and reducing the size and color of the birthmark.
  6. Oral Prednisolone: Prednisolone is an oral corticosteroid that can be prescribed for severe cases of nevus flammeus. It helps to reduce inflammation and minimize the appearance of the birthmark.
  7. Oral Interferon-alpha: Interferon-alpha is an antiviral medication that has been used off-label to treat nevus flammeus. It may help decrease the size and color intensity of the birthmark.
  8. Pulsed Dye Laser Therapy: Pulsed dye laser therapy is a commonly used treatment for port-wine stains. The laser emits light that targets the blood vessels within the birthmark, causing them to coagulate and fade gradually.
  9. Intense Pulsed Light (IPL) Therapy: IPL therapy uses a broad spectrum of light to target the blood vessels in the nevus flammeus. It can be an effective treatment option, particularly for lighter skin types.
  10. Fractional Laser Therapy: Fractional laser therapy involves creating tiny wounds in the skin using laser technology. This stimulates collagen production and helps reduce the appearance of port-wine stains.
  11. Nd:YAG Laser Therapy: Nd:YAG laser therapy is often used for deeper and darker port-wine stains. It works by emitting laser light that is absorbed by the blood vessels, leading to their destruction.
  12. Flashlamp Pulsed Dye Laser Therapy: Similar to pulsed dye laser therapy, flashlamp pulsed dye laser therapy uses intense light to target the blood vessels in nevus flammeus. It is effective in reducing redness and improving skin texture.
  13. Cryotherapy: Cryotherapy involves freezing the affected skin using liquid nitrogen. This method destroys the blood vessels in the nevus flammeus, causing the birthmark to fade gradually.
  14. Chemical Peels: Chemical peels involve applying a chemical solution to the skin to exfoliate the outer layer. This treatment can help improve the appearance of port-wine stains by promoting new skin growth.
  15. Microdermabrasion: Microdermabrasion uses a device with a rotating abrasive surface to remove the outer layer of skin. It can be beneficial in reducing the visibility of nevus flammeus.
  16. Photodynamic Therapy (PDT): PDT involves applying a photosensitizing agent to the skin, followed by exposure to a specific wavelength of light. This combination destroys the blood vessels within the birthmark.
  17. Silicone Gel Sheets: Silicone gel sheets are often used as a post-treatment option for nevus flammeus. They help to flatten and soften the skin, reducing the visibility of the birthmark.
  18. Vascular-Targeted Photodynamic Therapy: This advanced form of photodynamic therapy specifically targets the blood vessels in the port-wine stain, leading to their destruction and subsequent fading of the birthmark.
  19. Electrocautery: Electrocautery involves using a high-frequency electric current to destroy the blood vessels in the nevus flammeus. It is particularly effective for smaller, localized birthmarks.
  20. Tattoo Cover-up: In cases where other treatments are not suitable or desired, tattoo cover-up can be considered. Skilled tattoo artists can create designs that effectively camouflage the port-wine stain.

Conclusion: Nevus flammeus, or port-wine stain, can be effectively managed with various drug treatments. From topical medications to laser therapies and other innovative techniques, there are multiple options available to fade and improve the appearance of the birthmark. It is important to consult with a dermatologist or healthcare professional to determine the most suitable treatment based on individual circumstances. With advancements in medical technology, individuals with nevus flammeus can now have access to effective treatments that can enhance their quality of life and boost their self-confidence.