A wolf in sheep ’s clothing: Adult-onset urticaria pigmentosa masquerading as simple lentigines

We present a case of new onset UP in an adult masquerading as simple lentigines. Unlike in children, in adults the presence of UP should prompt a thorough evaluation for systemic mastocytosis (SM) as the literature reports that 90-95% cases of adult-onset cutaneous mastocytosis are diagnosed with SM. A 31-year-old male without significant past medical history complains of ‘darkening spots’ on his left foot and trunk.
Source: Journal of the American Academy of Dermatology - Category: Dermatology Source Type: research