The foreskin is cracked, red, swollen and painful, which may be caused by excessive friction, glans penis and eczema, etc. It is recommended to go to the hospital in time for further examination to clarify the cause of the disease. 1. If there is a long foreskin, accompanied by excessive masturbation and sexual life is too rough and so on may lead to excessive pulling, friction, cracking and redness, swelling and pain and so on. 2. If the circumcised or circumcised people usually do not pay attention to personal hygiene, not timely cleaning, may lead to the accumulation of foreskin scale, triggering bacterial and fungal infections such as glans penis, which leads to the appearance of redness, swelling, hot pain and even cracked foreskin phenomenon. 3. Prolonged exposure to hot environments or a lot of sweating without attention to timely cleaning, etc., may lead to the emergence of eczema of the foreskin, resulting in itching, redness, swelling and even cracking of the foreskin and so on. If there is unclean sex and other behavior, also does not exclude the infection of genital herpes and other sexually transmitted diseases, so it is recommended to go to the hospital in time for further examination to clarify the cause of the disease.