How do you get phimosis?

Inflammation.: In adults, inflammation of the foreskin can cause a scarring reaction that restricts its normal elasticity. Inflammation can be caused by infections of the skin, chronic irritation from poor hygiene, and injury to the foreskin or small tears. Skin problem such as lichen sclerosis can also affect the skin. If it restricts erections or impedes the urine stream, circumcision may be necessary.