A swollen hand with a bulge may be related to trauma, boils, tenosynovitis and other causes. 1. Trauma: If the hand is squeezed and other traumatic injuries, it can cause local soft tissue damage or fracture, and may appear as a bulge in the hand, accompanied by the symptom of swelling. 2. Boils: If the hair follicles of the hand are infected by pus-filled bacteria such as Staphylococcus aureus, it can cause local inflammatory reaction, resulting in a bulge in the hand, which may be accompanied by redness, swelling, pain and other symptoms. 3. Tenosynovitis: chronic, aseptic inflammation of the tendon sheath caused by repeated mechanical friction can cause swelling of the lesion, small nodules can be felt near the joints, and there will be pain when pressed. It is recommended that patients with swollen hands go to the hospital in a timely manner to clarify the cause of the disease and standardize the treatment under the guidance of the doctor to avoid delays in the condition.