Hm, difficult to tell.
The more I look at it, it looks like a piece of stuck shed. All wrinkled up.
Poor thing probably has been trying to get it off, and rubbed his nose on stuff, causing the wrinkling.
Put a couple wet hand towels in a container (lukewarm wet) and put the snake in there with it. Wring the towels out enough to where they aren't sopping wet. Make sure some of the towel is in top of the snake, loosely.
Keep checking of course. You want to see what happens to that nose when the moist, humid air hits it. Might very well just be old skin that will soften up enough to be rubbed off..