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Lichen planus may be categorized as affecting mucosal or cutaneous surfaces.. Cutaneous forms are those affecting the skin, scalp, and nails. [10] [11] [12]Mucosal forms are those affecting the lining of the gastrointestinal tract (mouth, pharynx, esophagus, stomach, anus), larynx, and other mucosal surfaces including the genitals, peritoneum, ears, nose, bladder and conjunctiva of the eyes.
Lichen morphology – a lichen's external appearance and structures are very different than those of its individual partners. [10] Ascocarp – the fruiting body of a lichen, which contains the asci. [11] Ascus (pl. asci) – a sexual, fungal spore-bearing structure, typically sac-like in shape. [12]
Lichen planopilaris (acuminatus, follicular lichen planus, lichen planus follicularis, peripilaris) Lichen planus of the nails; Lichen spinulosus (keratosis spinulosa) Lipedematous alopecia (lipedematous scalp) Localized acquired hypertrichosis; Localized congenital hypertrichosis; Longitudinal erythronychia; Longitudinal melanonychia
A fruticose lichen may have flattened "branches", appearing similar to a foliose lichen, but the underside of a leaf-like structure on a fruticose lichen is the same color as the top side. The leaf-like lobes of a foliose lichen may branch, giving the appearance of a fruticose lichen, but the underside will be a different color from the top side.
Plate XXXIII, Lichen planus et acuminatus Fig 1 (left) Lichen acuminatus seu pityriasis rubra pilaris, right upper arm and elbow Fig 2 (centre) Lichen acuminatus seu pityriasis rubra pilaris, palm of right hand. Fig 3 (right) Lichen planus, back of right wrist and hand General Collections Keywords: Skin Diseases
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Wickham striae or Wickham's striae are whitish lines visible in the papules of lichen planus and other dermatoses, typically in the oral mucosa. [1] The microscopic appearance shows hypergranulosis. They are named after Louis Frédéric Wickham. [2] [3]
Lichen planus Pterygium unguis (or dorsal pterygium [ 1 ] : 660 ) forms as a result of scarring between the proximal nailfold and matrix, with the classic example being lichen planus , though it has been reported to occur as a result of sarcoidosis and Hansen's disease .