Pictures? In all likelihood it's just an area that's been roughed up a bit. This can sometimes happen due to prey scratching at them (if I'm remembering correctly you feed live?) but in my experience that is only temporary and the scales will go back to normal after a day or so. Could also be something in the tank that the snake is rubbing against and roughing up the scales, so double check and make sure there are no sharp edges or anything the snake can get to. Raised scales could also happen due to an infection; if this is the case, you would probably see fluid buildup or swelling at the base of the scales causing them to stick out. That's less likely IMO though.