not a burn the warm side only gets about 93 degrees ( temp gun and vet said it not a burn ) when we wnet first time. WE think he was trying to swueeze out of the tub and the lid rubbed the spot sore ( during the night/day) (between my cleaning him on a tuesday and finding thi that wensday evening when I was going to feed) and he pulled back in and it just got infected fast ( or deep tissue type bruise) but the shot ewre causing it it to reduce but in the last week we notice it gotten worst. SO got ot make a vet appointment for next week.