Is this scale rot? Skin infection?

[Bogertophis]

This is an excellent point. Petroleum-based ointment products cause scales to slough off over time. A better topical antiseptic/antimicrobial product for reptiles is a product like Vetericyn, which is a water-based gel that is also safe for use around the animal's eyes and mouth.

Agree, but when it appears there is no breakage of the skin (as appears to be the case to me in photos above), none of these topicals will help anyway.
This just looks like a little subcutaneous bleeding inside a few scales that got bent backwards...it should clear up fine on it's own. It there was any actual bleeding or oozing, I'd for sure use Vetericyn (or wipe with Betadine, at least).