How long after feeding did you notice the stretched skin, how long has it been since feeding and is the skin still stretched? Also, how old/large is your snake and the meal you fed? I've noticed on some of my males that they seem to be "larger" in the throat than other males or females. It becomes noticeable after they reach a certain size (about 150 - 200 grams). If that's what it is, I think it's just a "guy thing".