Dermatofibroma in a black tattoo: report of a case
An otherwise healthy 24-year-old male presented with an erythematous nodule involving a\ntattoo on his right lower leg. The eruption began two months after the placement of\nblack ink within a previously existing tattoo. He denied similar changes in previous\ntattoos. Clinical examination revealed an erythematous, freely movable nodule overlying\na black pigment zone on the right lower leg, with slight tenderness on pressure ().\nExamination of the hematoxylin-eosin stained histological sections of an excisional\nbiopsy revealed nodular dermal proliferation of fibroblast-like cells embedded in a\ndense collagen matrix. These cells displayed an irregular arrangement, but no\ncytological atypia. The overlying acanthotic epidermis showed basal hyperpigmentation.\nIn addition, extracellular deposits of coarse black pigment were observed, particularly\nabove the spindlecell proliferation (,\n and ).