Lichen planushttps://en.wikipedia.org/wiki/Lichen_planus
Lichen planus o se fa'ama'i e a'afia ai le pa'u, lauulu, ma le mucous membranes. O lo'o fa'aalia i le polygonal, pa'u mafolafola, ma i le i'uga o le Wickham's striae. E masani ona a'afia le lima i tua, tapulima, ogalaau, vae pito i luma, ma le mucosa i totonu. E le iloa le mafuaʻaga, ae e manatu o se taunuuga o le autoimmune, ma o le amataga e le o iloa.

Ina ia faʻamaonia le lichen planus, e mafai ona faia se biopsy o le pa'u. Direct immunofluorescence (DIF) e mafai ona aoga i tagata o lo'o maua i le vesiculobullous autoimmune disease e fesoasoani e fa'ailoa le tulaga.

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  • O le manu'a lautele i ivi uma e lua e le masani. I lenei tulaga, o isi fa'ama'i (lichen simplex chronicus) e masani ona sili atu ona masulomia.
  • Pa'epa'e pa'epa'e o le Lichen planus i le mucosa (alafau).
  • O le tele o papules malo mageso e faʻaalia. O se uiga masani o le Lichen planus.
  • Leukoplakia ― se pa'epa'e i le gutu.
  • 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) o se ma'i tiga umi e tele ona a'afia ai tagata matutua i le ogatotonu o latou tausaga. E mafai ona faʻaalia i luga o le paʻu po o le mucous membranes e pei o le gutu, vaʻa, esophagus, pusa leo, ma le ufiufi mata. E 'ese'ese fo'i fo'i ona sau le LP e fa'atatau i le va'aiga mageso ma le mea e aliali mai ai. O su'esu'ega o lo'o fautau mai ai o nisi ituaiga o LP, e pei o mea e a'afia le esophagus po'o mata, atonu e le lava le iloa. O nisi ituaiga o LP, e pei o le hypertrophic ma le erosive i le gutu, e mafai ona mamafa tele ma umi le taimi. O isi mea e pei o vaila'au po'o le faʻafesoʻotaʻi ma nisi o mea e mafai ona fa'atupu mageso e foliga tutusa.
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 ose ma'i o le pa'u ua fa'ailogaina i patupatu violē, mafolafola ma pa'epa'e e mafai ona matua mageso ai. O manu'a nei o le pa'u e mafai ona fa'atiga, aemaise lava pe a matua a'afia ai le gutu po'o le itutinosa. I tulaga ogaoga, oral lichen planus e ono fa'atupula'ia ai le fa'atupuina o se ituaiga o kanesa o le pa'u. E mafai foi ona afaina le ulu ma le fao. E ui o le mafua’aga o le tele o mataupu e le o iloa, o nisi e ono fa'asoina e nisi vailaʻau po'o le ma'i hepatitis C. Togafitiga e masani ona aofia ai kulimi malolosi mo mataupu fa'apitonu'u ma fa'ama'i gutu mo fa'amasani lautele.
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 o se tulaga e mafua ai le fulafula i le tino puipuia, ma maua ai faʻailoga iloga i le paʻu ma i le mucous membranes. E afea ai pe tusa ma le 5% o tagata matutua, e masani lava i fafine, ma e masani ona amata i le vaeluagalemu o tausaga. O le afai o le tautala e va'aia e o'o atu i le 77% o mataupu, e tele lava ina afea ai le alafau i totonu. E ui ina le lagona e nisi tagata ni fa'ailoga, o isi e ono o'o i le tiga ma fa'alavelave i nisi mea'ai (fa'ata'ita'iga, acidic, spicy) po'o le pa'u fulunifo.
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.