Swelling in a single finger usually results from an injury or minor infection. It may also be a sign of arthritis, gout, or a benign growth. Swelling in one finger is usually not a cause for concern.

Hand tumors or masses are common. The majority of hand tumors are benign, meaning they are not cancer. When malignant, or cancerous, most of these tumors are types of skin cancer. Cancers within ...