well the obvious answer is: stop doing sit-ups. but seriously it sounds like you may be overdoing the sit-ups or performing them incorrectly. doing sit-ups should not cause the skin to rub off your tailbone. traditional sit-ups aren't really a recommended form of exercise anymore as they may cause lower back issues. abdominal crunches are the preferred exercise and they shouldn't rub your tailbone raw because your skin shouldn't be moving in the tailbone area. at the very least take care to perform your sit-ups on some type of padding. and don't do any sit-ups until your wounds heal. skin wounds can become infected fairly easily and you want to avoid that. you may want to visit webmd's fitness & exercise community to discuss your exercise regimen with other people and experts. they might be able to help you figure out why you're having this annoying problem with sit-ups. hope this helps!
when doing sit-ups the skin around my tailbone is rubbing raw what can i do to prevent this?