BLUE TONGUE SKINKS

My baby bluey has has this sore near his leg for a while and is getting worse I've just noticed another one forming near his arm can someone please help identify what's happening please

Looks like scale rot though not confirmed, I'd take this guy to a vet ASAP. Probably kept in sub-optimal conditions before you got him. I have seen this happen from unclean damp conditions. Please keep us posted.