Hi
that looks like a seriously burn what are using for a heat source in the cage heat rock or heat pad. i reconmend a heat rock ive had mine for 3 years now and ive havnt had no problems with it yet working great and my 5 pythons lay on it all the time and there not burnt. another thing you can do for that burn is take a teaspoon of iodine put that in a coffee cup and rest warm water to touch and then put the iodine on ur snake and that will help with bacterial and any cuts burns maybe and then wait min 2 n rise her off quite good
Also go to this web page these ppl know what there talking about there experts some are im a member there its great place http://snakebytestv.ning.com/profiles/blog/list
Gl with it