How is subcutaneous nodule caused?

Subcutaneous nodules are more likely to occur on the scalp, elbow extension, Achilles tendon, joints and other parts subject to friction, rarely on the nose and ears, showing a hard round or oval painless nodules. Subcutaneous nodules grow slowly, some people will persist, but some people will disappear when the disease is relieved. Subcutaneous nodules are associated with high titers of serum rheumatoid factor, rheumatoid active lesions, and severe joint destruction. Most patients with subcutaneous nodules resolve spontaneously and do not need treatment. However, once abnormal subcutaneous nodules are found, they should be immediately examined and treated in hospital.