Yea...happaned to my baby as well. Had it on the right ear and took it to the vet, who administered ketamine, lanced it, drained, and applied antibiotics. Said he couldn't be sure whether the left ear would develop as well, so I waited.
Now my turtle has a left bump 1/2 the size of his head. I'm pretty close in thinking bout lancing it myself. The exotic vet here is going to charge $110 to do what many people can do at home if they have the skills to do it.
I'd administer anesthesia myself if I knew the correct dosage, etc ( I work in a animal lab but apply isoflurane on mice, not reptiles).
Johnny