[GarterGuy]

Definitely sounding more like some sort or bacterial or fungal scale rot. With out pics, it's rather hard to tell. Are the snakes kept on moist substrate? Did he/she have this when you got him/her? Is it something that you're just now noticing or is it something that's now getting worse? If it is getting worse, and the living conditions are all up to parr, might be time to see a vet.