It is not always good to grow a snake slow or fast. This decision has long-ranging effects on fertility, health, and domestication. In my veterinary centers, we evaluate a snake's skin just like we examine eyes, liver, or heart. The skin is an integral part of a snake's overall picture. It gives us clues to the owner's diligence in husbandry.
Most problems center on their lack of good heat and appropriate humidity.
We also see classic cases of external parasites like mites and ticks that feed on this layer of nutrition. And of course, just because your snake has shed, it doesn't imply perfect health. If your snake has a problem shedding, evaluate his surroundings. The answer may be right in front of you. But if it doesn't clear properly, let a qualified exotics veterinarian do what he enjoys doing.