pityriasis : Idioms & Phrases
pityriasis alba
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noun common form of pityriasis (usually in children or young adults) characterized by round patches of depigmentation
WordNet
pityriasis rosea
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noun pityriasis in which an itchy rash develops over the trunk and extremities
WordNet
Pityriasis versicolor
NL. (Med.) , a parasitic disease of the skin, characterized by the development of reddish or brownish patches.