LAUSR

DEAR EDITOR, A 38-year-old woman was referred to the department of dermatology because of an itching skin disorder localized in the red part of a multicoloured tattoo on the right forearm. There were no other skin abnormalities or tattoo complaints. On physical examination, we observed an elevated and partly hyperkeratotic plaque in the red area with acneiform inclusions in the dermis. Histopathological evaluation showed interface dermatitis, lymphohistiocytic inflammation and cyst-like structures with epithelium and keratotic material. The skin disorder was diagnosed as a hypersensitivity reaction to the red tattoo pigment, with an excessive hyperkeratotic pattern with epidermoid cysts.