I seriously would not wait until the 24th, that's going on 3 weeks, that's way too long. #1 he's in pain and is suffering, especially if it hurts him when he is pooping, and #2 and most importantly they go downhill FAST! Sometimes they'll have something like this and they'll seem fine, they've had it for a while and you think they can wait a little longer, then BAM they stop eating and drinking, get very lethargic, and die. Especially if it's an abscess, it could become a systemic infection very quickly and that will kill him fast. If you have to drive hours longer one way to get him to a certified Herp vet then you need to do it. Find the next closest certified reptile vet and call them. If you tell us where you live we can help you find qualified reptile vets.
How long has he had this lump? It's pretty large...
How long has he had this lump? It's pretty large...