I'm guessing it's a dent and the snake is dehydrated. What kind of enclosure are you using, how are you heating it, and what is the humidity in the enclosure?
I got him from pet smart.. i know thats bad.. i don't think its a dent, his eye is perfectly normal. i should take him to the vet right? but that spot on his mouth i didnt notice until someone pointed it out... is that mouth rot?