Slide show: Common skin rashes

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Lichen planus

Lichen planus (LIE-kun PLAY-nus) usually appears as purplish, often itchy, flat-topped bumps (lesions), most often located on the inner forearm and near the wrists or ankles. Other common locations include the lower back, neck and legs.

The condition rarely worsens after the first couple of months, but it may persist for months or years. Mild cases may need relatively simple at-home care or no treatment. When symptoms are severe, such as pain or significant itching, drug treatment may improve symptoms.

Lichen planus may also affect mucous membranes, genitals, the scalp or nails. The lesions associated with these sites generally cause more discomfort. The symptoms are more difficult to manage, often persist for long periods and often recur after initial healing.

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