Rady Children's Hospital - San Diego 3020 Children's Way San Diego, California 92123 (858) 576-1700 www.rchsd.org
What's a Cyst?
Cyst
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A cyst is a sac that is filled with air, liquid, or pus. Cysts can happen in different parts of the body. They can get infected and then hurt or swell. Some kids who have acne may have cysts in their skin.