Rheumatoid arthritis does not have specific skin manifestations. Rheumatoid arthritis is an immune-mediated erosive arthritis, clinically characterized by systemic symmetrical multiple joint swelling and pain, accompanied by morning stiffness, often lasting for more than an hour. Rheumatoid arthritis can affect the proximal interphalangeal joints and middle joints of both hands, as well as both wrists, elbows, shoulders, ankles, knees, and other joints. Some patients may experience involvement of the temporomandibular joint. Rheumatoid arthritis can also have extrarticular manifestations, such as affecting the hematological system, which may result in mild to moderate anemia, or affecting the lungs, which can lead to interstitial pneumonia or pulmonary fibrosis.