DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Erythema nodosum rash (red area, centre) on a 16-year-old girl's leg. This patient is on the oral contraceptive pill. Erythema is a redness of the skin due to dilation of the blood vessels which lie beneath its surface. In erythema nodosum, the redness is associated with tender, bruise-like swellings. In some cases, it is associated with drugs and hormones, including those used in the oral contraceptive pill.
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