Erosive Pustular Dermatitis of the Scalp

Last updated: February 8, 2026Reviewed date: February 8, 2026Reading time: 9 min read
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Article Summary

Erosive pustular dermatitis of the scalp, also known as scalp folliculitis, is a type of skin condition characterized by the formation of painful, red, and swollen bumps on the scalp. These bumps may contain pus and can be accompanied by itching, burning, and scaling of the affected area. This condition can be chronic and can be caused by a variety of factors, including bacteria, yeast,...

Key Takeaways

  • This article explains Causes in simple medical language.
  • This article explains Symptoms in simple medical language.
  • This article explains Diagnosis in simple medical language.
  • This article explains Treatment in simple medical language.
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Definition

Erosive pustular of the scalp, also known as scalp folliculitis, is a type of skin condition characterized by the formation of painful, red, and swollen bumps on the scalp. These bumps may contain and can be accompanied by , burning, and scaling of the affected area. This condition can be and can be caused by a variety of factors, including bacteria, yeast, fungus, hormonal imbalances, and underlying skin conditions.

Erosive pustular dermatitis of the scalp, also known as scalp folliculitis or neutrophilic folliculitis, is a chronic and recurring skin condition that affects the scalp and hair follicles. This condition is characterized by the presence of painful pustules, erosions, and crusts on the scalp, which can lead to scarring and hair loss. The exact cause of erosive pustular dermatitis of the scalp is not known, but it is believed to be related to a combination of , environmental, and immunological factors.

Causes

The exact causes of erosive pustular dermatitis of the scalp are not well understood, but a number of factors have been identified as contributing to its development.

  1. Infections

Infections caused by bacteria, fungi, or viruses can cause and erosions on the scalp. Staphylococcus aureus is a common bacterium that can cause erosive pustular dermatitis of the scalp. Other bacteria that have been associated with this condition include Streptococcus pyogenes and Haemophilus influenzae. infections, such as tinea capitis, can also contribute to the development of erosive pustular dermatitis of the scalp.

  1. Allergies

Allergic reactions to certain hair products or medications can result in the development of erosive pustular dermatitis of the scalp. Common allergens include hair dyes, hair relaxers, and hair styling products. Allergic reactions can also occur in response to certain medications, such as antibiotics, antifungals, and drugs.

  1. Diseases

Autoimmune diseases, such as pemphigus vulgaris, can result in the formation of erosions and pustules on the scalp. In these conditions, the immune system mistakenly attacks healthy skin cells, leading to inflammation and tissue damage.

  1. Hormonal Imbalances

Hormonal imbalances, such as those that occur during , can also contribute to the development of erosive pustular dermatitis of the scalp. These imbalances can result in changes in the skin’s oil production, leading to dryness and increased susceptibility to skin infections.

  1. Genetics

There is some evidence to suggest that genetics may play a role in the development of erosive pustular dermatitis of the scalp. This condition is more common in families with a history of autoimmune diseases or skin conditions, suggesting that there may be a genetic predisposition to the development of this condition.

  1. Environmental Factors

Environmental factors, such as exposure to harsh chemicals, extreme weather conditions, and high levels of stress, can contribute to the development of erosive pustular dermatitis of the scalp. These factors can weaken the skin’s barrier, making it more susceptible to and inflammation.

The exact cause of erosive pustular dermatitis of the scalp is often difficult to determine, as multiple factors can contribute to its development. However, it is important to identify and treat the underlying cause of this condition, in order to prevent its and minimize the risk of scarring and hair loss.

Symptoms

The main symptoms of EPDS include:

  1. Scalp Erosions and Ulcers: One of the most distinctive and noticeable symptoms of EPDS is the presence of painful erosions and ulcers on the scalp. These lesions are typically circular, shallow, and may be covered by a thin layer of crust or . The affected skin may also be tender and bleed easily.
  2. Pustules: Another hallmark of EPDS is the formation of pustules, which are small, raised, fluid-filled blisters that are often accompanied by redness and . The pustules may be filled with a yellowish fluid, and they can be itchy and painful.
  3. Alopecia: EPDS can also cause hair loss, known as alopecia. The hair loss may be patchy or diffuse, and it can result in significant hair thinning or baldness.
  4. : Itching is another common symptom of EPDS, and it can be and persistent. The itching may be accompanied by burning and stinging sensations.
  5. : Pain is also a common symptom of EPDS, and it is often related to the erosions and ulcers that are present on the scalp. The pain may be severe and persistent, and it can make it difficult to sleep, work, and perform daily activities.
  6. Symptoms: In some cases, EPDS may be accompanied by systemic symptoms, such as , malaise, , and . These symptoms may indicate that the condition has spread beyond the scalp and is affecting other parts of the body.
  7. Nodules: Some individuals with EPDS may develop small, raised, firm nodules on the scalp. These nodules may be accompanied by redness and swelling, and they may be itchy and painful.
  8. Scarring: EPDS can cause significant scarring of the scalp, which can result in permanent hair loss and disfigurement. The scars may be raised, thick, and discolored, and they may be accompanied by itching and pain.

EPDS is a complex condition that can have a significant impact on an individual’s quality of life. The symptoms can be distressing and disabling, and they may require long-term treatment and management. The exact cause of EPDS is not known, but it is believed to be related to a combination of genetic and environmental factors. There is no cure for EPDS, and treatment is focused on managing the symptoms and preventing the condition from progressing.

Diagnosis of Erosive Pustular Dermatitis of the Scalp

The diagnosis of erosive pustular dermatitis of the scalp is made through a combination of examination, , and laboratory tests. A dermatologist may start by asking about the patient’s symptoms, including the of symptoms, duration, and any other skin conditions the patient may have.

Physical Examination

The dermatologist will perform a physical examination of the scalp and look for signs of redness, itching, and -like eruptions. The dermatologist may also examine the hair and skin under a microscope to look for any signs of inflammation or infection.

Skin Scraping Test

A skin scraping test may be performed to examine the skin under a microscope and look for any signs of bacteria or fungal infections. The dermatologist will gently scrape the affected area with a scalpel and collect a small sample of skin cells. This sample will then be examined under a microscope to determine if there are any signs of infection or inflammation.

Culture Test

A culture test may be performed to determine the cause of the infection and to identify the type of bacteria or fungus responsible for the condition. A small sample of the affected skin will be taken and placed on a culture medium. The sample will then be incubated for a few days to allow the bacteria or fungus to grow. The dermatologist will then examine the culture to determine the type of infection and the best course of treatment.

Blood Test

A blood test may be performed to check for any underlying health conditions that may be contributing to the development of erosive pustular dermatitis of the scalp. This test may include a complete blood count, a , and a blood test to check for any autoimmune conditions.

Treatment

The following is a list of treatments for erosive pustular dermatitis of the scalp:

  1. Topical Corticosteroids

Topical corticosteroids are one of the most commonly used treatments for erosive pustular dermatitis of the scalp. These medications work by reducing inflammation and itching, and they can also help to prevent further outbreaks. Topical corticosteroids are usually applied directly to the affected areas of the scalp and can be used in the form of creams, ointments, or lotions. Some of the most commonly used topical corticosteroids for erosive pustular dermatitis of the scalp include hydrocortisone, triamcinolone, and clobetasol.

  1. Antibiotics

Antibiotics are another common treatment for erosive pustular dermatitis of the scalp. These medications are used to treat infections that can contribute to the development of this condition. Antibiotics can be taken orally or applied topically, depending on the severity of the condition. Some of the most commonly used antibiotics for erosive pustular dermatitis of the scalp include erythromycin, clindamycin, and metronidazole.

  1. Immune Suppressants

Immune suppressants are medications that work by suppressing the immune system. These medications are used to treat erosive pustular dermatitis of the scalp when other treatments have been ineffective. Immune suppressants can be taken orally or applied topically, depending on the severity of the condition. Some of the most commonly used immune suppressants for erosive pustular dermatitis of the scalp include cyclosporine, methotrexate, and azathioprine.

  1. Light Therapy

Light therapy is a treatment that involves exposing the affected areas of the scalp to specific types of light. This therapy has been shown to be effective in treating erosive pustular dermatitis of the scalp by reducing inflammation and promoting healing. Light therapy can be performed using UV light, red light, or blue light, depending on the severity of the condition.

  1. Biologic Therapies

Biologic therapies are a newer type of treatment for erosive pustular dermatitis of the scalp. These therapies are designed to target specific parts of the immune system that contribute to the development of this condition. Biologic therapies can be taken orally or applied topically, depending on the severity of the condition. Some of the most commonly used biologic therapies for erosive pustular dermatitis of the scalp include tumor necrosis factor (TNF) inhibitors, interleukin (IL) inhibitors, and Janus kinase (JAK) inhibitors.

  1. Topical Tar Preparations

Topical tar preparations are a type of treatment that involves applying tar directly to the affected areas of the scalp. Tar is a natural substance that has been shown to be effective in treating erosive pustular dermatitis of the scalp by reducing inflammation and promoting healing.

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Which doctor may help?

Dermatologist or general physician; emergency care for severe allergic reaction.

What to tell the doctor

  • Take photos of rash progression and bring list of new medicines/foods/cosmetics.

Questions to ask

  • Is this allergy, infection, eczema, psoriasis, drug reaction, or another skin disease?
  • Is steroid cream safe for this place and duration?

Tests to discuss

  • Skin examination
  • Skin scraping/KOH test if fungal infection is suspected
  • Biopsy only for unclear or serious lesions

Avoid these mistakes

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  • Seek urgent care for swelling of lips/face, breathing trouble, widespread blisters, or rash with fever.

Medicine safety and first-aid guide

This section is for patient education only. It does not replace a doctor, pharmacist, or emergency care.

Safe first steps

  • Avoid heavy lifting, sudden bending, and prolonged bed rest.
  • Use comfortable posture and gentle movement as tolerated.
  • Discuss physiotherapy, X-ray, or MRI only when clinically needed.

OTC medicine safety

  • For mild back pain, pain-relief medicine may be discussed with a doctor or pharmacist.
  • Avoid repeated painkiller use if you have kidney disease, stomach ulcer, uncontrolled blood pressure, or are taking blood thinners.

Avoid these mistakes

  • Do not start antibiotics without a proper medical decision.
  • Do not use steroid tablets or injections casually for quick relief.
  • Do not delay emergency care because of home remedies.

Get urgent help if

  • Back pain with leg weakness, numbness around private area, loss of urine/stool control, fever, cancer history, or major injury needs urgent care.
Medicine names, dose, and timing must be decided by a qualified clinician or pharmacist after checking age, pregnancy, allergy, other diseases, and current medicines.

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Patient health record and symptom diary

Write your symptoms, medicines already taken, test results, and questions before visiting a doctor. This note stays on your device unless you print or copy it.

Doctor to discuss: Medicine doctor / pediatrician for children / qualified clinician
Tests to discuss with doctor
  • Temperature chart and hydration assessment
  • CBC with platelet count if fever persists or dengue/other infection is possible
  • Urine test, malaria/dengue tests, chest evaluation, or blood culture only when clinically indicated
Questions to ask
  • What is the most likely cause of my symptoms?
  • Which warning signs mean I should go to emergency care?
  • Which tests are really needed now?
  • Which medicines are safe for my age, pregnancy status, allergy, kidney/liver/stomach condition, and current medicines?
  • Do I need antibiotics, or is this more likely viral?

Emergency warning signs such as chest pain, severe breathing difficulty, sudden weakness, confusion, severe dehydration, major injury, or loss of bladder/bowel control need urgent medical care. Do not wait for online information.

Safe pathway to proper treatment

Care roadmap for: Erosive Pustular Dermatitis of the Scalp

Use this simple roadmap to understand the next safe steps. It is educational and does not replace examination by a doctor.

Go to emergency care if you notice:
  • Severe or rapidly worsening symptoms
  • Breathing difficulty, chest pain, fainting, confusion, severe weakness, major injury, or severe dehydration
Doctor / service to discuss: Qualified healthcare provider; specialist depends on symptoms and examination.
  1. Step 1

    Check danger signs first

    If danger signs are present, seek emergency care and do not wait for online information.

  2. Step 2

    Record the symptom story

    Write when symptoms started, severity, medicines already taken, allergies, pregnancy status, and test results.

  3. Step 3

    Visit a qualified clinician

    A doctor, nurse, or qualified healthcare provider can examine you and decide which tests or treatment are needed.

  4. Step 4

    Do only useful tests

    Do tests after clinical assessment. Avoid unnecessary tests, random antibiotics, or repeated medicines without diagnosis.

  5. Step 5

    Follow up and return early if worse

    If symptoms worsen, new warning signs appear, or treatment is not helping, return for review quickly.

Rural patient practical tips
  • Take a written symptom diary and all previous prescriptions/test reports.
  • Do not hide medicines already taken, even herbal or over-the-counter medicines.
  • Ask which warning signs mean urgent referral to hospital.

This roadmap is for education. A real diagnosis and treatment plan requires history, examination, and clinical judgment.