DefinitionLichen planus is a chronic skin condition. It causes itchy, flat, scaly patches on the wrists, legs, trunk, or genitals. It can also affect the inside of the mouth and vagina. There it resembles a white spider web. It may ulcerate. Rarely, it can also become cancerous. The scalp and fingernails can also be affected. It may become wart-like in thickness. Lichen planus may continue on and off for months or years. Scratching makes this condition worse.
|Section of Skin with Lichen Planus|
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CausesNot much is known about the cause. It is possibly an immunologic reaction due to genetic factors. It may be brought on by certain medications or diseases.
Risk FactorsLichen planus is more likely to occur in the presence of:
- Hepatitis C
- Systemic lupus erythematosus
- Certain prescription medications
- Graft vs. host disease
- Dental materials
SymptomsLichen planus may cause:
- Itching, flat-topped purplish bumps or scaly patches—especially on the palm side of the wrists, the top of the foot and shins, the trunk, or the genitals
- Hair loss
- Abnormal appearance to the nails
- Milky-white, spider web-like patches in your mouth or vagina, with or without burning or discomfort
DiagnosisYour doctor will ask about your symptoms, medications, and medical history. A physical exam will be done. Usually can be diagnosed by the appearance of the rash. You may be referred to a dermatologist.If the diagnosis is unclear, a skin biopsy may be done.
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