Also... Snakes heal VERY slowly. It took me 5 months to heal up a snake with a burn wound. 3 months for a gash on a one's neck.
With possible septicemia, it can take a while for everything to line up and begin healing because the body won't always start healing properly until the cause of the infection in the bloodstream is gone.
If anything, photograph the progress so you can compare it. When you're looking at it every day it may not seem like a big change when really, that's just how snakes are.