Nodules on the fingers are firm lumps that grow under the skin near the joints. According to WebMD, nodules are found most often in patients with severe rheumatoid arthritis. Also known as rheumatoid nodules, they don't always cause pain or limit movement, but can in some cases.
Nodules can also grow on the vocal chords, lungs, heart and other internal organs. There are disease-modifying antirheumatic drugs that can reduce the size of nodules, but they don't always work. Cases in which nodules become infected or cause severe symptoms can require surgery. To avert serious side effects, it is important for patients with nodules to see their doctor on a regular basis, notes WebMD.