Hey guys I picked up a jackson's from NERD recently and hes been eating like a pig (including right from my hand same day as coming home hehe, great personality) and I was taking care of his cage today and emptying the catch dish for his drip, and noticed tward the back of one side and a bit further up his mouth wasnt closed all the way like he had some kind of sore, one on each side.
I've got a low watt heat lamp on one side of the cage 24 hours a day(not touching the screen but slightly raised above it) and an 18" uvb bulb... it generaly stays in the lo 70s ambient in the room hes in but his cage obviously stays a bit warmer with the heat lamp on it, hes got a large live pothos , and a couple of those fake vines in there, I have newspaper on the bottom, and as I mentioned I water him with a drip, hes been eating crickets. Any idea what could be the problem? Hes a sub adult male by the way.
I'm concerned about his condition as NERD has no sort of guarantee on chams, but I figured it would be better to get one there than mail order because of the stress of shipping and all the good luck I've had with their animals. Any help? 

