Sounds like it could be a burn. Are you using an UTH (under tank heater/heat mat)? If so is it regulated? With what? You need a thermostat (not to be confused with a thermometer).
As far as the feeder size, get yourself a digital scale and weigh your snake and its prey. You should be feeding 10-15% of your snakes body weight every 5-7 days. They can eat meals much larger than this without issue, although it isn't recommended. Hopefully the clicking you hear isn't coming from an URI.
AKedit: BTW, since your snake has an injury, I would strongly recommend you clean its tub/tank/whatever very well and keep your snake on clean paper towels. I would clean it daily.
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