Most of the sex penis microcracking pain is caused by the foreskin glans, eczema and other reasons, but also may be rough action, penile caused. 1. glans penis: external pathogenic bacterial infection or allergic factors caused by glans penis, causing local congestion, swelling, resulting in the symptoms of sex penis microcracking pain. 2. Eczema: internal and external stimulation of a variety of factors caused by the local inflammatory reaction, may also cause local oozing or skin roughness and dry cracks, mossy changes, may also lead to the phenomenon of sex penis microcrack pain. 3. rough action: too rough action during sex, or improper sexual posture, may also cause the local foreskin to be pulled, cracks caused by sex penis microcrack pain. 4. Phallus: the narrow opening of the foreskin, tightly hooped in the glans, can not reveal the glans and the coronal groove, penile erection sex friction, will cause the phenomenon of phallus parts of the skin microcracking pain. Sexual life penis microcrack pain, there may be other reasons, need to go to the hospital in time to check, clear cause, active treatment.