Cracks in the skin of the penis may be caused by circumcision, bacterial infection and severe friction. 1. In patients with prepuce, penile skin cracks may be caused by penile erection. 2. Bacterial infection, unclean life of mold, bacteria, etc. caused by the local occurrence of infection of the foreskin glans, penile eczema, folliculitis, etc. will trigger an increase in the permeability of the capillaries of the penile skin, skin cracking phenomenon. 3. Excessive friction, inappropriate underwear, repeated friction will make the penis skin cracks, coitus vaginal dryness, strenuous action will also trigger the penis skin cracks. There may be other reasons for cracks in the penile skin. Usually choose cotton loose underwear, pay attention to life hygiene, to avoid bacterial infection, it is recommended to go to the regular hospital examination, timely treatment.