Pityriasis alba

Pityriasis alba is a common skin condition primarily occurring in children and usually seen as dry, fine-scaled, pale patches on the face. It is self-limiting and usually only requires use of moisturizer creams. The condition is so named for the fine scaly appearance similar to pityriasis versicolor and the pallor of the patches that develop.

Signs and Symptoms

The condition is characterized by the development of white patches on the skin. These patches are usually located on the face, but can also appear on the upper arms, neck, and upper middle region of the body. The patches are often round or oval, and have a characteristic appearance of fine scales. The patches may be itchy, but are usually asymptomatic.

Causes

The exact cause of pityriasis alba is unknown. It is thought to be associated with eczema and, as such, dry skin appears to be a precipitating factor. The condition is not contagious.

Diagnosis

Diagnosis is typically based on the characteristic appearance of the skin lesions. In some cases, a skin biopsy may be performed to rule out other conditions. Other conditions that may be considered include vitiligo, tinea versicolor, and postinflammatory hypopigmentation.

Treatment

Treatment is not usually necessary as the condition often resolves on its own. However, if the patches are itchy or cosmetically concerning, treatment may be pursued. This can include the use of moisturizing creams and, in some cases, topical steroids. Sun protection may also be recommended as sun exposure can make the color difference more noticeable.

Prognosis

The prognosis for pityriasis alba is generally very good. The condition is not harmful and does not lead to skin cancer. The patches usually disappear within a year, but can sometimes last longer.

See Also

• Dermatology
• Skin Pigmentation

References

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