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.
Note: All information on KidsHealth® is for educational purposes only.
For specific medical advice, diagnoses, and treatment, consult your doctor.
Images provided by The Nemours Foundation, iStock, Getty Images, Veer, Shutterstock,