What does a diabetic ulcer on the foot look like?

Any, usually round..: Break in skin-usually under first, fifth metatarsal or heel if red or with pus, its infected.

Ulcer: Either a complete opening through the skin or a red spot is called a pre-ulcer.

Have it evaluated.: A diabetic foot ulcer is best diagnosed with a physical exam. Your physician will ask you to remove your shoes in order to inspect your feet. They will look for redness, calluses, bruising, blistering, swelling, and for open sores. Sometimes the ulcer may be hidden and will be discovered following the debridement of calluses or the deroofing of blisters.