its been like that for 3 weeks and you say you cant afford to take it to the vet but an exam is what $70 and most of them will work with you. if youve been treating it at home for 3 weeks and it still looks like that then obviously its not working. that eather a badly infected burn or scale rot and if it dosnt get to the vet its going to suffer and die. borrow some money, hit a pawn shop, or something and take it to the vet or give it to someone who will