Pityriasis rotunda

Pityriasis rotunda is a rare, chronic skin condition characterized by perfectly circular, scaly patches with no inflammation. It is more common in people of African or Asian descent and is equally common in both men and women. The cause of pityriasis rotunda is unknown, but it has been associated with internal diseases, particularly those of the liver and cancer.

Symptoms

The primary symptom of pityriasis rotunda is the appearance of large, perfectly round patches of dry, scaly skin. These patches are usually found on the trunk, arms, and legs, but can also appear on the face and neck. The patches are usually asymptomatic, but can sometimes cause mild itching.

Causes

The exact cause of pityriasis rotunda is unknown. However, it has been associated with a number of internal diseases, particularly those of the liver and cancer. Some researchers believe that the condition may be caused by a genetic mutation, while others believe that it may be an autoimmune disorder.

Diagnosis

Pityriasis rotunda is diagnosed based on the characteristic appearance of the skin lesions. A skin biopsy may be performed to confirm the diagnosis and to rule out other skin conditions that can cause similar symptoms.

Treatment

There is no specific treatment for pityriasis rotunda. Treatment is usually aimed at managing the symptoms and may include the use of moisturizers and topical steroids. In some cases, the condition may resolve on its own without treatment.

See also

• Dermatology
• Skin conditions
• Autoimmune disorders

References

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