Lichen planus is a rash characterized by flat-topped, reddish-purplish lesions that most often appear on the wrists, forearms, shins and ankles. In rare cases, it can also affect the hair, nails and mouth. The major complaint is itching, which is often severe.

What Causes It?

The cause of lichen planus is unknown. There are many theories that suggest lichen planus can be classified as an autoimmune disease. Fortunately, it is not an infectious skin disorder therefore it’s impossible to catch or give to someone else.

What Can Be Done?

The two most common treatments include the use of oral or topical steroids and antihistamines to reduce inflammation and itching. These lesions can last from a few weeks to many months.

To learn more about lichen planus, visit WebMD.com.

Next, read about Moles.