Palmoplantar Eccrine Hidradenitis

There are several types of PPEH, including:

1. Primary PPEH: This type of PPEH occurs in the absence of any underlying medical condition. Primary PPEH is also known as idiopathic PPEH.
2. Secondary PPEH: This type of PPEH occurs as a result of an underlying medical condition, such as autoimmune disorders, metabolic disorders, or infectious diseases.
3. Hereditary PPEH: This type of PPEH is inherited in an autosomal dominant pattern. Hereditary PPEH is also known as acrokeratosis verruciformis of Hopf.
4. Acquired PPEH: This type of PPEH develops as a result of repeated exposure to certain chemicals, such as arsenic or herbicides.

Causes

The exact cause of PEH is not known, but there are several factors that are believed to contribute to its development. In this article, we will discuss the main list of causes for PEH and provide a detailed explanation of each.

1. Genetics:

Genetics plays a significant role in the development of PEH. Some people may be genetically predisposed to this condition, and it may run in families. Studies have shown that mutations in certain genes, such as NLRP1 and PSTPIP1, may increase the risk of developing PEH. However, more research is needed to fully understand the genetic factors involved in this condition.

2. Environmental factors:

Certain environmental factors may trigger or exacerbate PEH. Exposure to heat, humidity, and friction may increase the risk of developing this condition. People who work in occupations that require prolonged standing or walking, such as healthcare workers and retail employees, may be more susceptible to PEH.

3. Hormonal changes:

Hormonal changes may also contribute to the development of PEH. This condition is more common in women, and it may be associated with hormonal changes that occur during pregnancy, menopause, or the menstrual cycle. Some studies have suggested that estrogen may play a role in the development of PEH, but more research is needed to confirm this.

4. Inflammatory conditions:

PEH is an inflammatory condition, and it may be associated with other inflammatory conditions such as psoriasis and atopic dermatitis. These conditions may contribute to the development of PEH by causing inflammation in the skin and sweat glands.

5. Obesity:

Obesity may also increase the risk of developing PEH. Studies have shown that people who are overweight or obese are more likely to develop this condition. This may be due to the increased friction and pressure on the hands and feet that occurs with excess weight.

6. Smoking:

Smoking may also be a risk factor for PEH. Studies have shown that smokers are more likely to develop this condition than non-smokers. This may be due to the effects of smoking on the sweat glands and the skin.

7. Medications:

Certain medications may also contribute to the development of PEH. For example, some antihypertensive medications, such as beta-blockers, may increase the risk of developing this condition. Other medications, such as diuretics and antipsychotics, may also be associated with PEH.

8. Other medical conditions:

Certain medical conditions may also be associated with PEH. For example, diabetes and peripheral vascular disease may increase the risk of developing this condition. People with these conditions may be more susceptible to infections in the skin and sweat glands, which can lead to the development of PEH.

Symptoms

This condition occurs when sweat glands in these areas become inflamed and blocked. While the exact cause of PEH is unknown, it is thought to be related to genetics, hormonal changes, or exposure to certain chemicals. In this article, we will discuss the main list of symptoms associated with PEH and explain each symptom in detail.

1. Nodules or bumps on the palms of the hands or soles of the feet The most common symptom of PEH is the development of nodules or bumps on the palms of the hands or soles of the feet. These nodules are typically small, raised, and can be painful. They may be red, white, or flesh-colored.
2. Pain or tenderness PEH nodules can be painful, especially when pressure is applied. They may also be tender to the touch.
3. Itching Some people with PEH may experience itching in the affected area.
4. Sweating PEH is associated with excessive sweating in the affected area.
5. Thickening of the skin Over time, the skin in the affected area may become thickened and may have a rough texture.
6. Cracking or fissuring of the skin In severe cases, the skin in the affected area may crack or fissure, which can be painful and increase the risk of infection.
7. Discharge or drainage In some cases, the nodules may rupture and release a thick, yellowish discharge.
8. Secondary infections PEH nodules can become infected with bacteria, leading to secondary infections.
9. Scarring Chronic PEH can lead to scarring of the skin in the affected area.
10. Limitations in daily activities PEH can make it difficult to perform daily activities, such as walking or using the hands, due to pain or discomfort.

Diagnosis

The diagnosis of PEH is usually made based on clinical presentation and biopsy findings, although laboratory tests may also be useful in ruling out other potential causes of similar symptoms.

Diagnosis:

1. Clinical Presentation: The diagnosis of PEH is usually made based on the clinical presentation, which typically includes recurrent episodes of painful nodules, cysts, and abscesses in the palms and soles. These lesions may be associated with erythema, swelling, and tenderness, and can often be accompanied by hyperhidrosis (excessive sweating) in the affected areas. The lesions may also be accompanied by pruritus (itching), and the condition can be exacerbated by exposure to heat, friction, and moisture.
2. Physical examination: The first step in diagnosing PEH is a thorough physical examination of the affected areas. The doctor will look for the presence of small, painful, fluid-filled blisters or pustules on the palms and soles.
3. Medical history: The doctor will also take a detailed medical history, including any medications the patient is taking and any previous medical conditions or treatments. This can help to rule out other possible causes of the symptoms.
4. Blood tests: Blood tests may be performed to check for signs of inflammation or infection, which can help to rule out other possible causes of the symptoms.
5. Imaging tests: Imaging tests such as X-rays, CT scans, or MRIs may be performed to look for any underlying structural abnormalities that could be contributing to the symptoms.
6. Biopsy: A skin biopsy is often performed to confirm the diagnosis of PEH. Histopathological examination typically reveals a chronic inflammatory infiltrate of lymphocytes, plasma cells, and histiocytes in the eccrine sweat glands and surrounding tissue. There may also be evidence of epidermal hyperplasia and dermal fibrosis. In some cases, the biopsy may reveal granulomas or other features suggestive of an infectious or autoimmune process, which may require further investigation.

Lab Tests:

1. Complete Blood Count (CBC): A CBC is often ordered to assess for signs of infection, inflammation, or anemia. In cases of PEH, the white blood cell count may be elevated, and there may be an increase in the proportion of neutrophils (a type of white blood cell involved in the inflammatory response). Anemia is not typically seen in PEH.
2. Erythrocyte Sedimentation Rate (ESR) and C-Reactive Protein (CRP): These tests are often used to assess for the presence of inflammation in the body. In cases of PEH, both the ESR and CRP may be elevated, reflecting the chronic inflammatory process associated with the condition.
3. Blood Cultures: Blood cultures may be ordered to assess for the presence of bacterial infection, particularly in cases where the lesions are accompanied by fever or other signs of systemic illness. However, in most cases of PEH, blood cultures will be negative, as the condition is not typically associated with a bacterial infection.
4. Autoantibody Testing: Autoantibody testing may be considered in cases where the biopsy reveals features suggestive of an autoimmune process. Specific autoantibodies may be ordered based on the suspected diagnosis, such as anti-nuclear antibodies (ANA) in cases of suspected lupus erythematosus or anti-SSA/SSB antibodies in cases of suspected Sjogren’s syndrome. However, autoantibody testing is not typically indicated in the routine evaluation of PEH.
5. Microbiological Testing: Microbiological testing may be performed on tissue samples obtained from the lesions to assess for the presence of bacterial or fungal infection. This may include culture, microscopy, and sensitivity testing. However, as noted above, a bacterial infection is not typically associated with PEH, and microbiological testing is not routinely indicated in the evaluation of this condition.
6. Sweat gland biopsy: A biopsy of the sweat glands can be performed to examine the cells under a microscope. This can help to identify any abnormal cells or structures that may be contributing to the symptoms of PEH.
7. Cultures: A culture of the fluid from the blisters or pustules can be taken to identify any bacteria or other microorganisms that may be causing an infection.
8. Skin swabs: A swab of the affected area can be taken to identify any bacteria or other microorganisms that may be causing an infection.
9. Immunological tests: Immunological tests may be performed to check for the presence of antibodies or other markers of inflammation in the blood.
10. Skin patch testing: Skin patch testing can be performed to check for allergic reactions to certain substances that may be causing or contributing to the symptoms of PEH.

Treatment

There is no cure for PEH, but there are several treatment options that can help manage the symptoms and improve quality of life. In this article, we will discuss the main list of treatments for palmoplantar eccrine hidradenitis.

1. Topical corticosteroids: Topical corticosteroids are a common first-line treatment for PEH. These medications work by reducing inflammation and can help relieve pain and swelling. Corticosteroids come in a variety of strengths and formulations, including creams, ointments, gels, and foams. They are usually applied to the affected areas once or twice a day.
2. Topical calcineurin inhibitors: Topical calcineurin inhibitors are another option for treating PEH. These medications work by inhibiting the activity of the immune system cells that cause inflammation. They are often used as an alternative to corticosteroids, especially for long-term treatment, as they have fewer side effects. Topical calcineurin inhibitors come in the form of creams or ointments and are usually applied once or twice a day.
3. Systemic corticosteroids: Systemic corticosteroids are oral medications that can be used to treat severe cases of PEH that do not respond to topical treatments. These medications work by reducing inflammation throughout the body and can help relieve pain, swelling, and ulceration. However, they have significant side effects, including weight gain, increased blood sugar levels, and increased risk of infections. They are usually used for short periods of time and under close medical supervision.
4. Immunomodulators: Immunomodulators are medications that work by modifying the activity of the immune system cells that cause inflammation. They are often used to treat autoimmune diseases but can also be effective in treating PEH. Examples of immunomodulators that have been used to treat PEH include methotrexate, azathioprine, and mycophenolate mofetil. These medications are usually used for long-term treatment and under close medical supervision.
5. Biologics: Biologics are a new class of medications that target specific immune system cells or molecules involved in inflammation. They are often used to treat autoimmune diseases but can also be effective in treating PEH. Examples of biologics that have been used to treat PEH include infliximab and adalimumab. These medications are usually administered by injection or infusion and are used for long-term treatment under close medical supervision.
6. Laser therapy – Laser therapy, such as CO2 or Er:YAG laser, can be used to ablate the affected sweat glands and prevent the formation of new lesions. This treatment is less invasive than surgical excision and can be used in patients who are not candidates for surgery. Laser therapy is associated with minimal scarring, but multiple sessions may be required for optimal results.
7. Botulinum toxin injections – Botulinum toxin injections, such as onabotulinumtoxinA, can be used to reduce sweat production and prevent the formation of new lesions. This treatment is often used in patients who have failed other treatments or who
8. Topical therapies – Topical therapies are often the first line of treatment for PEH. They include the use of topical antibiotics, corticosteroids, and retinoids. Topical antibiotics, such as clindamycin, erythromycin, and mupirocin, can help control bacterial overgrowth and prevent secondary infection. Topical corticosteroids, such as betamethasone, can help reduce inflammation and relieve pain. Topical retinoids, such as tretinoin, can help regulate keratinization and prevent the formation of new lesions.
9. Oral antibiotics – Oral antibiotics are often used in combination with topical therapies for PEH. They are effective in controlling bacterial overgrowth and reducing inflammation. Commonly used antibiotics include doxycycline, minocycline, and clindamycin. Treatment duration is typically between 6 to 12 weeks, and the choice of antibiotic depends on the severity of the condition and the patient’s medical history.
10. Systemic retinoids – Systemic retinoids, such as acitretin and isotretinoin, are derivatives of vitamin A that can help regulate keratinization and prevent the formation of new lesions. They are reserved for severe cases of PEH that do not respond to other treatments. Systemic retinoids are associated with significant side effects, including dryness of the skin and mucous membranes, elevated liver enzymes, and teratogenicity. Therefore, they should only be prescribed by a dermatologist with experience in their use.
11. Intralesional corticosteroids – Intralesional corticosteroids, such as triamcinolone acetonide, can be injected directly into the affected lesions to reduce inflammation and pain. This treatment is often reserved for nodules and cysts that are resistant to other treatments. Intralesional corticosteroids can cause atrophy of the skin, so their use should be limited to a few injections in a given area.
12. Surgery: Surgery is sometimes used to treat severe cases of PEH that do not respond to other treatments. The goal of surgery is to remove the affected sweat glands and surrounding tissue. This can be done using a variety of techniques, including excision, electrocautery, and laser surgery. However, surgery is not always effective, and it can cause scarring and other complications.
13. Supportive care: In addition to medical treatments, supportive care can also help manage the symptoms of PEH. This can include wearing comfortable shoes and gloves, avoiding activities that worsen symptoms, and using bandages or dressings to protect ulcers. Physical therapy can also be helpful in improving mobility and reducing pain.