In one sentence, describe what the following article is about:

If you pull back your foreskin, exposing the head of your penis, but then are unable to slide the foreskin back over the head, you have a condition called paraphimosis. Because the retracted foreskin can cut blood flow to the tip of the penis, you should call your doctor or visit the hospital right away. Taking a warm shower may help soften and expand the foreskin enough to solve the problem, but don't be too forceful in trying to slide the foreskin back in place. You could cause the skin to tear or other damage. Smegma is nothing more than a buildup of shed skin cells underneath the foreskin. If you don't clean beneath your foreskin regularly, though, the smegma can develop a mucus-like texture and unpleasant odor, and can harbor bacteria that can lead to infection.  Teens and adults should clean beneath their foreskins every time they bathe or shower, using a mild soap and plenty of rinsing water. Younger children generally don't have to worry about smegma buildup, unless there is inflammation or discharge. In this case, see a doctor. If you experience redness and/or inflammation on the underside of your foreskin, the tip of your penis, or both, a fungal infection is the most likely culprit. Apply an over-the-counter antifungal cream to the area (as per the product instructions) to see if the issue clears up within a few weeks. If OTC antifungals don't help, or if the area becomes more painful, inflamed, or swollen, contact your doctor.
Get medical help if your foreskin is stuck in a retracted position. Wash your penis regularly to prevent a buildup of smegma. Use topical medications to treat redness or inflammation.