Check your feet every day for cuts, red spots, swelling, signs of infection, blisters, or ulcers. Ulcers can be especially difficult to treat and are a serious complication of diabetes. Seek medical advice early if there is any kind of foot injury, including sores, ingrown toenails, corns or calluses, warts, warm spots, and athlete’s foot. If you cannot see the bottoms of your feet, try using a mirror. You can also ask someone for help. Remember not to scratch any lesions you might find.