| 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) |
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| 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 ruber | An obsolete term for lichen planus. (05 Mar 2000) |
| lichen ruber moniliformis | A rare dermatosis consisting of small reddish papules arranged in narrow beaded bands and covering large areas of the body. (05 Mar 2000) |
| lichen ruber verrucosus | 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 sclerosus et atrophicus | A chronic, atrophic skin disease characterised by white, angular, flat, well-defined, indurated papules with an erythematous halo and follicular, black, keratotic plugs. It is the most common cause of kraurosis vulvae in females and balanitis xerotica obliterans in males. It is called also white spot disease and csillag's disease. (12 Dec 1998) |
| lichen scrofulosorum | Small asymptomatic lichen papules on the trunk of children with tuberculosis; acid-fast bacilli are not seen in the dermal granulomas. Synonym: acne scrofulosorum, papular scrofuloderma, papular tuberculid. (05 Mar 2000) |
| lichen simplex chronicus | A thickened area of itching skin resulting from rubbing and scratching. (05 Mar 2000) |
| lichen spinulosus | Eruption of conical papules, of unknown cause, which have an adherent scaly surface; may be related to lichen planus. (05 Mar 2000) |
| lichen striatus | A self-limited papular eruption occurring primarily in children (more commonly in females); the lesions are arranged in linear groups and usually occur on one extremity. (05 Mar 2000) |
| lichen strophulosus | An eruption of papules and vesicles at the orifices of sweat glands, accompanied by redness and inflammatory reaction of the skin. Synonym: heat rash, lichen infantum, lichen strophulosus, prickly heat, strophulus, summer rash, tropical lichen, lichen tropicus, wildfire rash. (05 Mar 2000) |