I've seen this many times, in many species often when getting close to a shed. Try and get the humidity up a little, maybe a tub big enough for the snake to soak in. Chances are it will be gone after the next shed cycle.
:eb: Scotty Allen :eb:
"For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return." -- Leonardo Da Vinci