title: Current concepts in lichen planus.
mesh_terms: D000818:Animals; D001485:Basement Membrane / Q000648:ultrastructure; D004848:Epithelium / Q000473:pathology; D006087:Graft vs Host Reaction; D006801:Humans; D008010:Lichen Planus / Q000276:immunology / Q000378:metabolism / Q000473:pathology; D008180:Lupus Erythematosus, Systemic / Q000473:pathology; D012867:Skin / Q000473:pathology