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Pityriasis rosea Guttate dermatosis (mycosis fungoides) 1. Parakeratosis in dome-shaped mounds 1. Scale-crusts in elongated mounds 2. Spongiosis usually prominent in foci 2. Spongiosis is slight or absent 3. Some acanthosis invariable 3. Little or no acanthosis 4. No lymphocytes aligned as solitary units in the basal layer 4. Lymphocytes often aligned as solitary units […]