54.0 MB (4.7 MB compressed)
3544 x 5327 pixels
30.0 x 45.2 cm ⏐ 11.8 x 17.8 in (300dpi)
DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
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A pilonidal sinus, a chronic abscess that develops in a congenital opening in the skin near the cleft at the top of the buttocks. Hair shafts, from local follicles or shed body hair, are present in the abscess & act as a focus for persistent inflammation. Healing is hindered by the presence of such non-degradable material. As part of the attempt at healing, epithelium migrates from the skin surface to form a sinus (a track) through the abscess cavity. Treatment of the abscess requires surgery to open and clean the sinus.
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