PC76, I don't know if a callus is dangerous for a diabetic, but I do know it is extremely important to take great care of your feet because of complications from diabetes, such as neuropathy or poor circulation. I get a pedicure at least once a month to have my nails trimmed and have my feet scraped and grated to keep the callus or build up of tough skin to a minimum. My feet are in really great shape and I plan to keep it that way! Be sure to go to a VERY reputable place that does pedicures and be sure they know you are a diabetic. Nails should be trimmed across, not angled and be sure you have great feeling in your feet before going. If I were you, I would make an appointment with a podiatrist to have your feet tested. Diabetics should do this at least once a year. And be sure not to walk around barefoot ever! That is extremely important. Also, be sure to wear shoes that are very comfortable and don't pinch your feet or are too tight or too big. I've learned to be kind to my feet. Good Luck!