Pityriasis alba: It sounds like you're describing pityriasis alba. Pityriasis alba is a condition that results from dry skin and is very common in children. It is a patchy lightening of the skin (not a starchy white depigmentation of the skin). It is not scaly and is usually asymptomatic. It tends to look worse in the summer as the affected skin does not tan. Most cases resolve in puberty when skin becomes oily.
Answered 5/6/2015
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