Lichen Planus  Lichen Planus is a condition that forms an itchy rash on the skin or in the mouth. CAUSES The exact causes of lichen planus are unknown. it may be related to an allergic or immune reaction. Risks for the condition include: Exposure to medicines dyes and other chemicals (gold .antibiotics' arsenic iodides, chloroquine, quinacrine, quinine, phenothiazines, and diuretics) Diseases such as hepatitis C Lichen Planus mostly affects middle aged adults. It is less in children. SYMPTOMS : Mouths sores may be tender or painful mild case may not cause pain  may  present on both side of tongue or inside of the cheek or gums look like blue white spots or pimples forms likes blue white spots or pimples form likes in  a lacy network  Gradually increase in size of the affected area. Some times form painful ulcers Skin sores Are usually found on the inner wrist legs torso or genitals  Are itchy  Have  even sides symmetrical and shape border  Occur in single lesion or clusters often a