LAUSR

A 24-year-old man with a personal history of vitiligo on the hands, ankles, and genitals that did not improve with topical corticosteroids and tacrolimus consulted for the recent appearance of a pruriginous skin lesion on his right knee. The patient denied having applied topical products or taken oral medication. He also denied having experienced injury or stings and having been exposed to sunlight. Examination revealed shiny erythematous-violaceous papules. These were indurated, confluent, and irregular and were arranged in a reticulated pattern on a whitish achromic macular base (Fig. 1A). Skin biopsy revealed lichenoid dermatitis with a band-like perivascular lymphocytic infiltrate and involvement of the hair follicle infundibulum and a significant