Penis always cracked may be the penis of infection factors, or allergy causes, may also be the foreskin and other factors. 1. Infectious factors: Penile skin or foreskin, glans and other parts of the external bacteria, fungi, trichomonas infection will cause an inflammatory reaction, resulting in the penis is always cracked and other symptoms. 2. Allergic reasons: penis contact with chemical fiber underwear, or soap, shower gel, condoms and other allergic reaction, may also cause the symptoms of the penis always crack. 3. Circumcision: The narrow opening of the foreskin wraps around the glans and prevents the foreskin from being turned up, and an erection of the penis can cause an increase in local tension, which may also lead to total penile fissure. There may be other reasons for total penile fissure, it is recommended to go to the hospital for examination to clarify the cause of the disease and timely treatment.