50.1 MB (5.1 MB compressed)
5120 x 3417 pixels
43.4 x 29.0 cm ⏐ 17.1 x 11.4 in (300dpi)
DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
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Close-up of infected sebaceous cyst on the back of a 54 year old male patient. A sebaceous cyst is a sac-like swelling under the skin filled with sebum, the oily product of the skin's sebaceous glands. It occurs when the glands become blocked. Most cysts heal on their own, but some require surgical removal.
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