There is a crust on the foreskin falls off and grows, consider with the glans, lichen planus, foreskin injury and other factors, need to go to the hospital for further examination to clarify the cause of the disease, timely medical treatment. 1. glans: generally due to glans will appear erosion, may appear on the foreskin there is a scab block fell and long phenomenon, glans may also appear itching, redness, swelling, erosion and ulcers and other symptoms. 2. lichen planus: usually due to lichen planus causes the glans to be covered with secretion drying after the formation of peeling, causing a crust on the foreskin block falls and grows the phenomenon, lichen planus generally will appear burning sensation, itching and other symptoms. 3. foreskin injury: may be due to the foreskin area is more serious injury, caused by a crust on the foreskin block off and long phenomenon, foreskin injury usually appear fever, pain and other symptoms. If there is a crust on the foreskin falls and grows phenomenon, in daily life, should pay attention to rest, appropriate exercise, keep local skin clean.