There are two common causes of redness and pain in the toe: 1. Soft tissue infection of the toe, most often in patients with nail infections, usually after nail clipping or accidental kicking, resulting in lesions and bacteria on the nail side, which invade the local soft tissue through the lesions and cause redness and pain. In addition to the symptoms of redness, swelling and pain, there is also a local inflammatory discharge or even pus, and there may be inflammatory granuloma formation. 2, arthritis of the toe, commonly gouty arthritis or rheumatoid arthritis. If you usually have elevated uric acid, and before the onset of the disease, have alcohol or eat seafood, eat animal offal and other high purine foods, it is likely to be gouty arthritis. To confirm which type of arthritis, you can go to the hospital to have your blood uric acid or rheumatoid triple test, which basically confirms the diagnosis.