There are many adverse effects of phimosis, including ingrown, infection, urethral stenosis and cancer. 1. Entrapment: If the opening of the foreskin is small, after forcibly turning it up, the coronal groove of the penis may be strangled, resulting in ischemia of the head of the penis and the foreskin, or even ulceration and necrosis, in which case it is necessary to go to the hospital as soon as possible to release the entrapment. 2. Infection: the foreskin is easy to deposit dirt under the skin to cause bacterial infection, resulting in infection, this time to follow the doctor’s instructions to give anti-infection treatment such as cefprozil dispersible tablets, to be controlled by inflammation, elective circumcision surgery. 3. Stricture of urethral opening: Small opening of foreskin or repeated infections will easily cause narrowing of urethral opening, which will lead to symptoms such as difficulty in urination and incomplete urination. 4. Cancer: Repeated foreskin infections and long-term stimulation of foreskin scales will cause excessive proliferation of cells in the penis, thus increasing the incidence of penile tumors. The circumcision must be consulted in the urology department as soon as possible for early diagnosis and treatment.