Lichen sclerosus is an uncommon skin condition that causes a distinctive rash and usually affects the genital skin around the vulva and anus. It most often looks like white patches on the skin. It can last for years and can cause permanent scarring. The cause is unknown. Lichen sclerosus is not an infection and it is not contagious. It usually affects females but can also affect men and boys. In boys, the foreskin can become tight and difficult to draw back. It can happen at any age but is most common before puberty or around menopause. Overall, it is much more common in adults than in children. Soap, talcum powder, antiseptics or non-prescription creams should be avoided. The most successful treatment is steroid ointment. Current research also suggests it usually gets better naturally.