Yes, wrinkles are very common and will almost always happen (some to less or more degree) when snakes are shedding. Do not bathe your snake. Just up the humidity. Bathing may make shedding worse for a snake because it could wash the natural oils a snake needs for shedding plus it is very stressful, even more so when they are shedding. Shedding is a very stressful time for snakes which is why many do not eat.
The wrinkles will disappear once you snake has shed.