Post a pic. With out a pic I'm guessing stuck shed or nose rub. If your noodle is checking things out an pushing on its cage the nose will get a mark or two.
The "cure" for stuck shed, soak your snake an use a wet towel for him to crawl around while gently rubbing him. This is to remove any stuck shed. You rub in the direction of the scales not against them!
If a nose rub it will be shed off an then the snake will start it again.
Good luck!
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