Lichen planus is a chronic inflammatory disorder of the skin and mucous membranes. It is characterized by specific bumps which are small, flat-topped and grow together. These bumps form the rough, scaly plaques on the skin. These bumps may also form in the lining of mouth or vagina. The exact cause of lichen planus is still not known but it usually arises after the hepatitis c virus. Some specific drugs having arsenic, bismuth, or gold as their composition may also be responsible for its onset.
Mostly lichen planus is relatively mild and affected individuals cured without any special treatment. To cure unpleasant appearance of the rashes topical corticosteroid creams or topical calcineurin inhibitors like may be recommended.