The normal foreskin of the penis looks like it can fully expose the head of the penis without making it impossible to expose the head of the penis or a small portion of it, and without physical discomfort. The foreskin is the skin of the penis and its shape correlates with age. It is normal for a young child to have a relatively long foreskin that wraps around the entire head of the penis. However, as the penis matures with age, the foreskin may retract, the opening of the foreskin gradually enlarges, and the head of the penis may be exposed. The foreskin will accompany the growth of the penis and the head of the penis is closely connected, play a role in protecting the head of the penis. If after puberty, the foreskin wraps around the head of the penis so that the head of the penis cannot be revealed, it can be diagnosed as phimosis. Patients may be accompanied by symptoms such as difficulty in urination, redness and swelling of the foreskin opening, purulent discharge, and pain. If the patient is not feeling well, it is recommended to go to the regular hospital in time for relevant examinations. Once diagnosed, patients need to actively cooperate with doctors to take relevant treatment measures.