The exact cause of lichen sclerosus isn't known. An overactive immune system or an imbalance of hormones may play a role. Previous skin damage at a particular site on your skin may increase the likelihood of lichen sclerosus at that location.
Lichen sclerosus isn't contagious and cannot be spread through sexual intercourse.
Lichen sclerosus often occurs in postmenopausal women, but also in men and children. In women, lichen sclerosus usually involves the vulva. In boys and men, uncircumcised males are most at risk, because the condition generally affects the foreskin.
In children, the signs and symptoms may improve at puberty.