DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Rheumatoid arthritis nodule on a 68-year-old woman's elbow. Rheumatoid arthritis is a condition where the body's immune system attacks the joints. It can result in nodules like this forming under the skin. The nodules can be excised if they are excessively large.
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