Lichen planushttps://en.wikipedia.org/wiki/Lichen_planus
Lichen planus est morbus chronicus inflammatorius et immuniter mediatum, qui cutem, ungues, capillos, membranas mucosas adficit. Notatur a papulis polygonis, planatis, et platis cum squamis albis subtilibus reticulatis (Wickham's striae). Vulgo afficit manus dorsales, flexurae carpi et antebrachia, truncum, crura anteriora et mucosa oralis. Causa incognita est, sed ex processu autoimmune cum ignoto initio putatur esse.

Ad confirmandam diagnosis lichenis planus cutanei fieri potest biopsia cutis. Immunofluorescens directa (DIF) utilis esse potest in aegris cum laesionibus bullosis ad differentiam conditionis a morbo vesiculobuloso autoimmundo.

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  • Lesiones latae in utris tibiis atypicae sunt. In hoc casu, alii morbi allergici chronici (lichen simplex chronicus) magis suspecti sunt.
  • Striationes albae non-erosivae Lichen planus in mucosa buccali (gena).
  • Lichen planus est plurium pruritus papularum chronicus. Species typica Lichen planus est.
  • Leukoplakia est macula alba in cavitate oris.
  • lichen planus atrophicus (Atrophic lichen planus)
References Cutaneous and mucosal lichen planus: a comprehensive review of clinical subtypes, risk factors, diagnosis, and prognosis 24672362 
NIH
Lichen planus (LP) Diuturna conditio inflammationis est quae in mediis annis adultis plerumque afficit. In cutis vel membranulis mucosis sicut oralis (oral), vulvovaginal (vulvovaginal), oesophagum (esophageal), larynx (laryngeal), et conjunctiva (conjunctival) potest. LP in diversas formas secundum quomodo lesiones spectant et ubi apparent. Studia suadent quaedam genera LP, sicut oesophagum vel oculos (ophthalmological) afficiunt, subdiagnosticari possunt. Quaedam LP formae, sicut in ore hypertrophica et erosiva (erosive) typi, possunt esse valde graves et diu perdurantes. Ceteri factores, sicut medicamentum vel contactum cum quibusdam substantiis, possunt esse triggers.
Lichen planus (LP) is a chronic inflammatory disorder that most often affects middle-aged adults. LP can involve the skin or mucous membranes including the oral, vulvovaginal, esophageal, laryngeal, and conjunctival mucosa. It has different variants based on the morphology of the lesions and the site of involvement. The literature suggests that certain presentations of the disease such as esophageal or ophthalmological involvement are underdiagnosed. The burden of the disease is higher in some variants including hypertrophic LP and erosive oral LP, which may have a more chronic pattern. LP can significantly affect the quality of life of patients as well. Drugs or contact allergens can cause lichenoid reactions as the main differential diagnosis of LP.
 Lichen Planus 10865927
Lichen planus est conditio cutis purpurea notata, papulis et maculis planis quae intensum pruritum causare possunt. Hae cutis laesiones dolere possunt, praesertim ubi os vel pudenda graviter afficiunt. In gravibus casibus, oral lichen planus periculum cancri cutis augere potest. Potest etiam ad capitis et ungues pertinere. Dum causa plerisque ignota est, quaedam medicamenta vel infectio hepatitis C provocare possunt. Curatio typice involvit cremās validās pro casibus localibus et steroids orāles pro casibus magis disseminatis.
Lichen planus is a skin condition marked by purplish, flat-topped bumps and patches that can cause intense itching. These skin lesions can be distressing, especially when they affect the mouth or genitals severely. In severe cases, oral lichen planus may even increase the risk of developing a type of skin cancer. It can also affect the scalp and nails. While the cause of most cases is unknown, some may be triggered by certain medications or hepatitis C infection. Treatment typically involves strong creams for localized cases and oral steroids for more widespread ones.
 Oral lichen planus 32753462 
NIH
Lichen planus conditio est ubi immunis systematis inflammationem creat, in notis distinctis in cute et membranis mucosis. Affectat circiter 5% adultorum, saepius feminarum, et circa mediam aetatem plerumque incipit. Involutio oralis apparet usque ad 77% casuum, maxime quae buccam (buccal mucosa) afficiunt. Dum aliqui symptomata aliqua non sentiunt, alii dolorem experiuntur et molestiam habent cum quibusdam cibis (exampla, acidica, piperata) vel dentifricium.
Lichen planus is an immune-mediated inflammatory condition leading to characteristic lesions on skin and mucous membranes. It presents in up to 5% of the general adult population with a female predilection (2:1); the onset is most commonly in middle age. Up to 77% of patients with lichen planus have oral disease, with buccal mucosa the most common subsite. The oral lesions may be asymptomatic, although a subset of patients have pain and difficulty tolerating certain foods (e.g., acidic, spicy) and toothpaste.