Prurigo pigmentosa: A case report with clinical, dermoscopic, and histological findings

Prurigo pigmentosa (PP) was originally reported in Japan. It is an uncommon inflammatory skin disorder that usually involves the neck and trunk and characterized by a sudden eruption of pruritic indurated macules, papules, and Vescio papules that involute, leaving a reticulated pigmentation. It commonly affects young adult females. PP was initially thought to have a predilection for the Asian race, however several cases have been reported worldwide. The exact etiology of PP is yet unclear. However, it has been associated with ketosis and a ketogenic diet. Oral antibiotic is a major treatment in this disorder, while topical steroid and antihistamines are not successful.