Please DON'T post pictures. I'd rather not see the damage...
The snake was your responsibility and they don't develop horrible scale rot overnight. So the fact is you let the snake get this way, now take some responsibility and take it to a vet. No quick fix. And if you can't afford a vet then surrender it to a rescue. I'm sorry if I sound mean. But it is tough love. I've heard way too many cases of this, been involved in one case personally and My Gosh my parents can take care of my snake husbandry wise while I am away at college and they know squat about snakes. So C'mon people! Very disappointing... and unacceptable.
GL with your snake.