ICD-11 definition : Lichen planus is an inflammatory disease of skin and mucous membranes characterized
by intense inflammation at the interface between epidermis/epithelium and dermis/corium.
Its clinical manifestations vary according to how acutely it develops and to where
it attacks. On the skin it typically presents as a symmetrical eruption of itchy,
flat-topped pink or purple papules or plaques. Involvement of the scalp or nail matrix
can produce permanent loss of hair or nails respectively. Although mucous membrane
involvement can be asymptomatic, it can cause significant pain and distress, particularly
when it is erosive.;
Lichen planus is an inflammatory disease of skin and mucous membranes characterized
by intense inflammation at the interface between epidermis/epithelium and dermis/corium.
Its clinical manifestations vary according to how acutely it develops and to where
it attacks. On the skin it typically presents as a symmetrical eruption of itchy,
flat-topped pink or purple papules or plaques. Involvement of the scalp or nail matrix
can produce permanent loss of hair or nails respectively. Although mucous membrane
involvement can be asymptomatic, it can cause significant pain and distress, particularly
when it is erosive.