Lichen sclerosus is a rare autoimmune inflammatory disease, also known as Lichen sclerosus et atrophicus. It is a skin and mucosae condition that affects particularly the tissue of the genital area in men and women. However, lichen sclerosus in men, also known as male genital lichen sclerosus, will often affect the foreskin and tip of the penis. It can affect men and boys of any age. The cause of lichen sclerosus in men is not fully known, however, it is not sexually transmitted and it rarely occurs in men who have been circumcised at a young age. The affected skin can feel sore, itchy and burn after sexual intercourse.