42.2 MB (3.3 MB compressed)
4599 x 3208 pixels
38.9 x 27.2 cm ⏐ 15.3 x 10.7 in (300dpi)
DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
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Sebaceous cyst on the scalp. Also called a steatoma or wen, this is a cyst arising in one of the skin's oil-secreting glands. Such cysts may grow to a large size; their contents, a yellow, cheese-like sebum, may become infected. They are treated by surgical removal.
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