As the shed comes free around the cloaca, it sometimes causes very minor trauma to the delicate tissue there, so a little trace of blood is normal.
If the cut is swollen, as you said, betadine or antibiotic ointment would be a good idea. Be sure to use the kind that does not contain any painkillers.
The cautions are because the petroleum jelly base can cause reptiles to slough scales. if you carefully confine it to the wound, however, this is not an issue--I've used it successfully numerous times for minor cuts or scrapes.
Keep a close eye on it for signs of infection, and consult a vet if the swelling increase or does not subside, if there's any reddening of the skin around it, if it doesn't appear to be healing well, etc.
Minor scratches, cuts, or scrapes are best treated immediately--waiting simply gives the wound time to seal, trapping bacteria inside.
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