Lichen planus is a condition that causes skin inflammation. The resulting rash can affect the skin on your arms, legs, scalp, nails, genital area and the inside of your mouth. For most people, it resolves without treatment. Some treatments can alleviate related symptoms, including itching.
Lichen planus (like-en play-nes) is a skin condition that causes a rash to develop on one area of your body or several parts of your body at the same time. It can affect your:
The cause of lichen planus is likely related to the immune system attacking cells of the skin or mucous membranes. It’s not clear why this irregular immune response happens. The condition isn’t contagious.
Lichen planus may be activated by:
Lichen planus symptoms depend on where it’s affecting your body:
Lichen planus doesn’t hurt. However, if you scratch your rash, you may break your skin, leading to an infection that can cause pain.
Lichen planus is not dangerous, but it can sometimes leave dark marks or scars on the skin, cause hair loss on the scalp, or lead to nail changes like thinning or breakage. In the mouth or genitals, it may cause burning, pain, or discomfort. Rarely, long-standing mouth patches may increase the risk of oral cancer, so regular check-ups are important.
Stress – emotional or physical stress can worsen symptoms.
Infections – especially Hepatitis C and other viral infections.
Medications – like NSAIDs (painkillers), beta-blockers, ACE inhibitors, antimalarials, and some antibiotics.
Dental materials – such as amalgam fillings or contact with certain metals (gold, mercury).
Allergic reactions – to chemicals, dyes, or other allergens.
Immune system dysfunction – the body’s own immune cells mistakenly attack the skin or mucous membranes.
Genetic tendency – family history may slightly increase risk.





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