My husband had foot surgery- could not put any weight on it- also first trip, a cast on the foot- then a medical boot, and in a wheel chair of course- was not required to take the boot off- they wanded the boot- and him- All TSA employees we encountered were all very respectful of his situation, and made it as easy as possible considering his condition.
Honestly if your toe is "bloody" you need to go back to your health professional and have it wrapped professionally so that it is very easily recognized as a medical problem- also- order up a wheel chair assist- then TSA will treat it as such. You should be pleasantly surprised as to their professional attitudes.