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Phimosis and paraphimosis are problems with the foreskin of the penis. Phimosis is when a foreskin can’t be pulled down (retracted) from the tip of the penis. Paraphimosis is when the foreskin is retracted but can’t move back up.
Posterior urethral valves are a problem with the urethra in a boy. The valves partly block urine flow because not enough urine can get through them to leave the body. This can harm the urethra, bladder, ureters, and kidneys.
A child with prune belly syndrome often can't fully empty his or her bladder. This can cause serious bladder, ureter, and kidney problems.
Peyronie disease causes hard, flat plaque to form under the skin on the tissue of the penis. The plaque often starts as an inflammation that may develop into scar tissue. It can cause pain and a sharp curve in the penis during erections.