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Dr. Alpana Mohta Ranka, MD, DNB, IFAAD, is a triple-board-certified dermatologist with over 100 research publications in peer-reviewed scientific journals.

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Ashy Dermatosis AKA Erythema Dyschromicum Perstans: Symptoms, Causes, Treatment, and Prevention

Updated: Nov 4, 2023

Ashy dermatosis, also known as Erythema Dyschromicum Perstans (EDP), is a rare, chronic skin disorder characterized by gray-blue or ashy patches on the skin.


Though not life-threatening, it can cause significant distress and aesthetic concerns for those affected.


This article will delve into the symptoms, causes, treatment, and prevention strategies for ashy dermatosis to help individuals suffering from this condition better understand it and find suitable solutions.

Symptoms of Ashy Dermatosis

The primary symptom of ashy dermatosis is the appearance of flat, well-defined, and ashy-gray patches on the skin. These patches often occur symmetrically on the body, typically affecting the face, neck, trunk, and limbs.


The patches may vary in size and can sometimes coalesce to form larger areas of discoloration. Although the condition is generally painless and non-itchy, some individuals may experience mild itching or burning sensations.

Causes of Ashy Dermatosis

The exact cause of ashy dermatosis remains unclear, and its pathogenesis is not fully understood. However, some factors and associations have been identified:

  1. Genetics: There might be a genetic predisposition to developing ashy dermatosis, as some cases tend to run in families.

  2. Autoimmune Response: It is speculated that the condition could be related to an autoimmune response, where the body's immune system attacks its healthy skin cells, leading to discoloration.

  3. Triggers: Certain factors, such as viral infections, parasitic infestation (whipworm), or environmental triggers including exposure to hair dyes, cosmetics and ammonium nitrate or barium sulphate might contribute to the development or exacerbation of ashy dermatosis. According to an article published in American Family Physician, drugs like chlorpromazine, tetracyclines, amiodarone, and thiazides are the most common drugs responsible for triggering ashy dermatosis.

Treatment Options

Treating ashy dermatosis can be challenging, and there is no specific cure. However, various treatment options can help manage the symptoms and improve the appearance of the skin:

  1. Topical Steroids: Mild to moderate cases of ashy dermatosis may respond well to the application of topical steroids. These creams or ointments can help reduce inflammation and lighten the affected areas.

  2. Topical Calcineurin Inhibitors: Healthcare providers may sometimes recommend topical calcineurin inhibitor, including tacrolimus or pemicrolimus, to control inflammation and promote repigmentation.

  3. Phototherapy: Narrowband ultraviolet B (NB-UVB) phototherapy has shown promising results in treating ashy dermatosis. This treatment involves exposing the affected skin to specific wavelengths of light, stimulating repigmentation.

  4. Systemic Treatments: For severe and persistent cases, oral corticosteroids, oral psoralens plus ultraviolet A (PUVA) therapy, or other immunosuppressive medications may be prescribed.

  5. Clofazimine is also being used as an experimental therapy with some success rates in treatment-resistant cases.

Please consult a dermatologist to start any treatment.

Preventive Measures

While ashy dermatosis may not be entirely preventable, there are measures individuals can take to minimize its impact:

  1. Sun Protection: Proper sun protection is essential to prevent the worsening of discoloration. Regularly wear broad-spectrum sunscreen with a high SPF and protective clothing outdoors.

  2. Avoid Triggers: If certain factors trigger or worsen your condition, try to identify and avoid them. This might include certain medications (chlorpromazine, amiodarone, thiazides, etc) or environmental irritants like hair dyes and cosmetics.

  3. Maintain a Healthy Lifestyle: Adopting a healthy lifestyle, including a balanced diet, regular exercise, and stress management, can support overall skin health.

Ashy Dermatosis Differential Diagnosis


Following are some differential diagnoses, although most of them can be easily ruled out:

  1. Pityriasis Versicolor: This is a fungal skin infection caused by Malassezia yeast. It presents with small, scaly patches that can be white, pink, or brown. Pityriasis versicolor is more likely to be itchy compared to ashy dermatosis.

  2. Lichen Planus: Lichen planus is an inflammatory skin condition characterized by itchy, purple or violaceous, flat-topped bumps that may develop a whitish lacy pattern. It often affects the wrists, ankles, and lower back.

  3. Post-Inflammatory Hypopigmentation: After certain skin injuries or inflammations, hypopigmentation (loss of skin color) can occur, leading to pale patches on the skin. These patches are often temporary and may resolve over time.

  4. Erythema Annulare Centrifugum (EAC): EAC is a rare skin condition that presents with raised red rings with central clearing. It can resemble the appearance of ashy dermatosis, particularly in the early stages.

  5. Drug-Induced Pigmentation: Some medications can cause pigmentation changes in the skin, resulting in gray-blue patches similar to ashy dermatosis. A detailed medication history is essential to identify this potential cause.

  6. Erythema Dyschromicum Perstans-like Drug Eruption: In some cases, certain medications can induce a drug eruption that resembles ashy dermatosis. These drug-induced eruptions may resolve upon discontinuing the offending medication.


The Highlights


Ashy dermatosis is a skin condition that can affect individuals of any age, race, or gender. While it may not pose serious health risks, the aesthetic impact can be distressing for those affected. Understanding the symptoms, causes, treatment options, and preventive measures can empower individuals to manage this condition effectively and enhance their skin health.


If you suspect you have ashy dermatosis or experience persistent skin discoloration, consult a dermatologist for an accurate diagnosis and personalized treatment plan.

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