DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Erythema nodosum on a calf. This condition is characterised by a red purple swelling, usually on the legs, and reflects another illness present in the body. The most common cause of erythema nodosum is a steptococcal infection of the throat but it may be triggered by other diseases such as tuberculosis and sarcoidosis. It may also occur as a reaction to certain drugs such as penicillin, salicylate or sulphonamide drugs. The swellings, which range from one to ten centimetres in diameter, are shiny and tender and disappear as soon as the underlying condition is treated.
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