title: Lichenoid delayed hypersensitivity reactions in tattoos.
abstract: Two patients with an inflammatory reaction in a red tattoo had histopathologic changes of lichen planus. The lesions demonstrated a lymphocytic bandlike infiltrate, liquefaction degeneration, acanthosis, hypergranulosis, and orthokeratosis and many hyaline bodies. Metal particles were observed in the region of the dermal-epidermal reaction. This probably is another example of the lichenoid reaction produced by delayed cellular hypersensitivity.
mesh_terms: D000328:Adult; D006801:Humans; D006968:Hypersensitivity, Delayed / Q000473:pathology; D008010:Lichen Planus / Q000209:etiology* / Q000473:pathology; D008297:Male; D012867:Skin / Q000473:pathology*; D013653:Tattooing / Q000009:adverse effects*