Starlord, reading extensively on your chosen species and/or group is part of the package of reptile keeping! It fuels the passion that is reptile keeping and also helps you to learn and refine your husbandry techniques. Why, I have spent just as much, if not more, on informative reptile books, than on actual lizards. But don't quote me on this, I am no mathematician.
Just by reading littlemay's link I was reminded of the book
The Arcadia Guide to Reptile and Amphibian Nutrition. By reading the list of important vitamins and minerals, and the roles they play when supplied to your reptile at just the right amount, or over or under-supplied, it may help you on your road to healing your snake effectively, and also, may help you to prevent another such incident. Just guessing here, but perhaps your snake's condition may have occurred from a vitamin/mineral deficiency due to your underfeeding? However, there must be other useful reading materials out there. Broaden your knowledge. Either way, good luck!
EDIT: This passage is directly quoted from the above mentioned book, page 55. It may be relevant in relation to littlemay's link in regards to Vitamin C, which appears to be related to Slippery Skin Disease.
"
Vitamin C is essential in the production of collagen. This, in turn, allows the production and repair of muscles, tissue, tendons, scales and skin . . . Vitamin C also works to speed up the skin-healing process, and may be useful after serious damage in terms of cuts and/or burns . . . Vitamin C is also a famous antioxidant that acts to free the body from toxins that left, if unchecked, may build-up and cause a problem . . . Vitamin C is found in plants . . . but can also be found in animal and insect sources. It could be that the plants that are eaten by insects and are eventually assimilated by the predator provide a source of usable Vitamin C to the predator. Vitamin C is also stored in small but usable amounts in and around the liver, kidneys, brain and other vital organs, and again in eggs."
Quote continues on to page 56. "
The sources of Vitamin C are many, and as it is required in small doses, a varied diet should provide the animal all that it needs."
Hope this helps in anyway.