lichen /li·chen/ (līk´'n)
1. any of certain plants formed by the mutualistic combination of an alga and a fungus.
2. any of various papular skin diseases in which the lesions are typically small, firm papules set close together.
lichen amyloido´sus a condition characterized by localized cutaneous amyloidosis.
lichen fibromucinoido´sus , lichen myxedemato´sus a condition resembling myxedema but unassociated with hypothyroidism, marked by a fibrocystic proliferation, increased deposition of acid mucopolysaccharides in the skin, and the presence of a circulating paraprotein; it may present as lichenoid papules or urticaria-like plaques and nodules.
lichen ni´tidus a chronic inflammatory eruption consisting of many, pinhead-sized pale, flat, sharply marginated, glistening, discrete papules, scarcely raised above the skin level.
lichen planopila´ris a variant of lichen planus characterized by formation of acuminate horny papules around the hair follicles, in addition to the typical lesions of ordinary lichen planus.
lichen pla´nus an inflammatory skin disease with wide, flat, violaceous, shiny papules in circumscribed patches; it may involve the hair follicles, nails, and buccal mucosa.
lichen ru´ber monilifor´mis a variant of lichen simplex chronicus with papules arranged in linear beaded bands.
lichen ru´ber pla´nus l. planus.
lichen sclero´sus a chronic atrophic skin disease marked by white papules with an erythematous halo and keratotic plugging, usually around the external genitalia or in the perianal region.
lichen scrofuloso´rum , lichen scrofulo´sus any eruption of minute reddish lichenoid follicular papules in children and young adults with tuberculosis.
lichen sim´plex chro´nicus a dermatosis of psychogenic origin, marked by a pruritic discrete or, more often, confluent papular eruption, usually confined to a localized area.
lichen spinulo´sus a condition in which there is a horn or spine in the center of each hair follicle.
lichen stria´tus a self-limited condition characterized by a linear lichenoid eruption, usually in children.
li·chen (l  k n)n. Any of various skin diseases characterized by patchy eruptions of small, firm papules. |
lichen
1. any of certain plants formed by the mutualistic combination of an alga and a fungus.
2. any of various papular skin diseases in which the lesions are typically small, firm papules set very close together, the specific kind being indicated by a modifying term.
lichen tropicus
see equine allergic dermatitis.
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