A pilonidal cyst is a fluid-filled sac under the skin in the lower back, near the crease of the buttocks. Some aren't visible, while others can look like a small pit or dimple in the skin.
Sometimes, a pilonidal (pie-luh-NIE-dul) cyst can become infected. One way that doctors can treat an infected cyst is with the Gips procedure.
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Reviewed by: KidsHealth Medical Experts
Date Reviewed: Jan 12, 2022
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