What causes the skin on the penis to crack?

Skin cracking on the penis can be caused by various factors. Common causes include phimosis (tight foreskin), balanitis (inflammation of the foreskin), and sexually transmitted diseases. Phimosis may lead to a narrow foreskin opening, making the foreskin prone to cracking or damage when retracting. Balanitis, due to irritation from inflammatory substances, can reduce the elasticity of the local skin, resulting in cracking. Sexually transmitted diseases, such as syphilis and genital warts, may also cause skin lesions. To accurately determine the cause and receive effective treatment, it is recommended to seek medical advice and undergo examination promptly. Meanwhile, maintaining good personal hygiene, regularly washing the penis, and changing into clean underwear can also help prevent such problems. For further information, please consult a qualified physician or refer to relevant medical resources.