Are lumps developing around joints a result of rheumatoid arthritis (RA)?

The presence of lumps (or nodules) is a fairly common result of rheumatoid arthritis (RA). In most cases, lumps are attached to the muscles that extend or straighten limbs or body parts. Located under the skin (subcutaneous), lumps are typically found on surfaces of the arms and elbows but are also prone to develop at pressure points on the feet and knees. Lumps most often occur in patients with more severe joint disease and are more common in men.