Phimosis is a condition in which the foreskin cannot be retracted behind the glans penis. In boys younger than 4 years of age, this is completely normal. In older boys and adults, however, the foreskin can usually be withdrawn easily to the corona (the ridge around the tip of the penis). Phimosis is usually not painful, but it may produce urinary obstruction with ballooning of the foreskin and may lead to chronic inflammation and does pose some risk of cancer of the penis in adult life. See paraphimosis.

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