Physiologic phimosis usually disappears around the age of 3 to 6 years. Phimosis is the narrow opening of the foreskin or the adhesion of the inner plate of the foreskin and the head of the penis so that the foreskin can not be upturned, the head of the penis can not be exposed, neonatal phimosis is the state of the fetus in the process of development of the inner plate of the foreskin and the head of the penis fused with each other resulting in the birth of a child after birth with the gradual development of the body, the phimosis will gradually disappear, boys about 3~4 years of age later, will gradually disappear. Physiological phimosis, if there is no special discomfort, can not be treated, can disappear on its own, but in ordinary life, should be to maintain local cleanliness and hygiene, to avoid the occurrence of the foreskin glans, if there is a narrow opening of the foreskin, upturning the difficult, do not force upturning the foreskin, to avoid the foreskin inlaid, the occurrence of the foreskin inlaid need to be taken in time for surgical treatment.