Excised pilonidal sinus (with post-operative scar, pink) near a 16-year-old boy's anus. A pilonidal sinus is a tract of infected skin and tissue that

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Excised pilonidal sinus (with post-operative scar, pink) near a 16-year-old boy's anus. A pilonidal sinus is a tract of infected skin and tissue that can develop between the buttocks in the anal cleft. It usually develops from an infected hair shaft. Surgery is needed if the condition develops into a painful abscess

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Photo credit: © DR P. MARAZZI/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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