Pilonidal sinus - Definition

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A pilonidal cyst, also called a pilonidal sinus, is a small mass located under the skin primarily found in the natal cleft between the buttocks, along the coccyx. These kinds of cysts mostly contain hair and skin, and tend to get infected on repeated occasions. Although they are completely benign, when inflamed these cysts can cause intense pain. A pilonidal cyst can be surgically removed if inflamed, painful, or too large, yet ablation cannot guarantee the cyst will not resurface.