| LSC | late systolic click; left side colon cancer; left subclavian; lichen simplex chronicus; liquid scint... |
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| lichen annularis | <dermatology> Benign granulomatous disease of unknown aetiology characterised by a ring of localised or disseminated papules or nodules on the skin and palisading histiocytes surrounding necrobiotic tissue resulting from altered collagen structures. (12 Dec 1998) |
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| lichen haemorrhagicus | A papular eruption due to haemorrhage into the hair follicles. (05 Mar 2000) |
| lichen iris | Ringworm with concentric rings of erythematous papules. (05 Mar 2000) |
| lichen lichens on bark | A mutualistic association of a fungus andphotosynthetic organism, either a unicellular alga or a cyanobacterium. Some lichens are used to make natural fabric dyes. (09 Oct 1997) |
| lichen myxoedematosus | A lichenoid eruption of papules or plaques of mucinous oedema due to deposit of glycosaminoglycans in the skin and fibroblast proliferation, in the absence of endocrine disease. See: scleromyxoedema. Synonym: papular mucinosis. (05 Mar 2000) |
| lichen nitidus | A chronic inflammatory disease characterised by shiny, flat-topped, usually flesh-coloured micropapules no larger than the head of a pin. Lesions are localised in the early stages, found chiefly on the lower abdomen, penis, and inner surface of the thighs. Distribution may become generalised as the disease progresses. (12 Dec 1998) |
| lichen nuchae | Lichen simplex of the neck, usually in women. (05 Mar 2000) |
| lichen obtusus | A form in which the papules are large and rounded instead of flattened. (05 Mar 2000) |
| lichen planopilaris | Follicular hyperkeratosis of the scalp with lymphocytic perifolliculitis and lichen planus elsewhere. Synonym: Graham Little syndrome, lichen planus et acuminatus atrophicans. (05 Mar 2000) |
| lichen planus | A primary disorder of the skin resulting in violaceous, polygonal, flat skin lesions that often pruritic (itchy). Seen commonly on the wrists, shins, lower back and genitalia. Involvement of the scalp may lead to hair loss. The cause of lichen planus is unknown, but may occur after the use of a drug (thiazide diuretics, phenothiazines, antimalarials). Treatment with topical corticosteroids is common. In most patients, spontaneous regression of the disease will be seen 6 months to 2 years after onset. (27 Sep 1997) |
| lichen planus annularis | A form in which the papules are grouped in ring figures. (05 Mar 2000) |
| lichen planus et acuminatus atrophicans | Follicular hyperkeratosis of the scalp with lymphocytic perifolliculitis and lichen planus elsewhere. Synonym: Graham Little syndrome, lichen planus et acuminatus atrophicans. (05 Mar 2000) |
| lichen planus follicularis | Lichen planus of the hair follicles, usually of the scalp. (05 Mar 2000) |
| lichen planus hypertrophicus | Verrucoid or warty lesions occurring on legs and thighs in association with lichen planus elsewhere. Synonym: lichen planus verrucosus, lichen ruber verrucosus. (05 Mar 2000) |
| lichen planus-like keratosis | A solitary benign papule or plaque, with microscopic features resembling lichen planus, occurring on sun-exposed or unexposed skin. Synonym: lichen planus-like keratosis. (05 Mar 2000) |