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A **pilonidal sinus** is a small tunnel near the tailbone, often caused by ingrown hairs, friction, or infection. It can become painful, swollen, and may develop an abscess filled with pus. Symptoms include pain when sitting, tenderness, redness, and recurring infections. Risk factors include sitting for long periods, excessive sweating, or family history. Treatment often involves draining the abscess and using antibiotics to treat infection. In chronic cases, surgery to remove the sinus may be needed. Maintaining good hygiene and avoiding friction can help prevent recurrence, but the condition may return if not properly treated.