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Lichenoid eruptions are dermatoses related to the unique, common inflammatory disorder lichen planus, which affects the skin, mucous membranes, nails, and hair. [74] [75] [76] Annular lichen planus Lichen planus actinicus; Atrophic lichen planus; Bullous lichen planus (vesiculobullous lichen planus) Erosive lichen planus
Lichen planus Irregular epidermal hyperplasia with a jagged “sawtooth” appearance, compact hyperkeratosis or orthokeratosis, foci of wedge-shaped hypergranulosis, basilar vacuolar degeneration, slight spongiosis in the spinous layer, and squamatization. The dermal papillae between the elongated rete ridges are frequently dome shaped.
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 planus: white or greyish lines on the lichen planus lesions Widal test: Georges-Fernand Widal: microbiology: enteric fever: serum agglutination; obsolete(?) Winterbottom's sign: Thomas Masterman Winterbottom: tropical medicine: trypanosomiasis: posterior cervical chain adenopathy Wolff–Parkinson–White triad: Sir John Parkinson, Paul ...
But sometimes the parts of a lichen species common name are common names of other lichen genera. For example, Psilolechia lucida, in the genus Psilolechia, is commonly called "sulphur dust lichen". [1] [2] But "sulphur lichen" refers to the genus Fulgensia, and "dust lichen" refers either to the genus Chrysothrix or the genus Lepraria. [1] [3 ...
Polydactylous longitudinal erythronychia has been most commonly associated with Darier's disease [10] and lichen planus [11] but has also occasionally been associated with acantholytic epidermolysis bullosa, [12] no association, [13] graft-versus-host disease, [14] [15] hemiplegia, [16] and systemic amyloidosis. [11]
This is possible due to the action of lichen phenolics such as usnic acid derivatives. [34] From the 1950s the lichen product usnic acid was the object of most antitumour research. These studies revealed some in vitro antitumour activity by substances identified in two common lichens Peltigera leucophlebia and Collema flaccidum. [35]