Small bumps on the knuckles of the fingers may be caused by a variety of reasons, usually due to insect bites or sweat rashes formed by sweat retention and extravasation of sweat into the surrounding tissues. In addition, it may also be related to a variety of factors, including eczema, trauma, osteoarthritis, rheumatoid arthritis, tenosynovitis, tendon sheath cysts, tumors, etc. It is recommended that patients go to the hospital in a timely manner to clarify the cause and carry out targeted treatment: 1. Eczema: eczema is an inflammatory manifestation of the skin with a pronounced tendency to exude caused by a variety of internal and external factors. The rash has no fixed form, itching is intense, prone to recurring episodes, and has a tendency to become chronic. The lesions are mainly papules, papules, blisters, scales or crusts, usually accompanied by intense itching, which can lead to small bumps at the finger joints; 2. Trauma: after the patient’s fingers are stimulated by contusions, knocks and other traumatic injuries, resulting in local soft tissue contusions, after healing, small bumps may form scar-like hyperplasia, which is normal; 3. Osteoarthritis: wear and tear of the cartilage of the finger joints, metamorphosis, periarticular hyperplasia and accumulated inflammation, causing the muscles and ligaments around the joints to show relative stiffness, resulting in degenerative changes in the joint cartilage and small bumps; 4, rheumatoid arthritis: if the patient has rheumatoid arthritis in the finger joints themselves, it can lead to swelling and pain in the finger joints, showing small bumps; 5, tenosynovitis: if the patient has tenosynovitis in the finger joints, inflammatory lesions are gradually deposited, prone to finger Fibroplasia and osteophytes in the joints can be manifested as small bumps in the joints and cause painful symptoms; 6, tendon sheath cysts: tendon sheath cysts are benign lumps containing jelly-like mucus near the joint capsule or tendon sheath, which can be manifested as small bumps in the finger joints, usually accompanied by soreness, radiating pain and other symptoms; 7, tumors: some tumors may also cause finger joints to appear Small bumps, it is recommended to go to the hospital for X-ray examination to determine the correct treatment plan after a clear diagnosis.