It's either, your snake is skinny, some what dehydrated, or about to shed. That happened to mine just recently, she had little folds of skin. I know what you mean, but she didn't eat for about 2 weeks. I would wait about 3 days for a shed, than feed her.
0o0o0o0o0r you can try to feed now, if nothing than you know it's a shed. This is nothing you really should get worried over though.