DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
A bunion on a woman's right foot. A bunion is a swelling of the joint between the big toe (hallux) and the first metatarsal bone. Bunions are frequently caused by the wearing of ill-fitting shoes. Severe cases may lead to the formation of a bursa, a small sac of fibrous tissue filled with synovial fluid. In extreme cases, corrective surgery may be required.
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