A Rare Case of Prurigo Pigmentosa in Iranian Sibling Couple.

Prurigo Pigmentosa is a rare inflammatory skin disease of unknown origin, characterized by pruritic, erythematous papules on the chest, back, neck, and anterior abdomen. The eruption resolves with reticular hyperpigmentation that cosmetically affects the patient's quality of life. Previous reports highlighted the role of the Ketogenic diet in triggering the disease in young female patients, however, no study reported the occurrence of Prurigo Pigmentosa in siblings of one family, unrelated to a ketogenic diet. Here, we report two sisters diagnosed with Prurigo Pigmentosa without undergoing a Ketogenic diet.