Pityriasis alba : Pityriasis alba is characterized by patches of hypopigmentation, usually distributed on the face, neck, upper trunk, and proximal extremities. The lesions range from 0.5 to 5 cm in diameter, with well-defined but somewhat irregular borders, and fine scale. They usually are asymptomatic but may be pruritic. Usually accentuated by tanning.
Answered 2/3/2016
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