I also have this same problem. I bought a juvenile bp at a pet store about a week and a half ago and shortly after getting him I noticed scales that look like the op's scales appearing in patches on my snakes body. He doesn't have it on his head, just in like clumps of 2 or 3 scales, and 1 really big patch on his side. I'm not sure when the last time he shed was, he hasn't shed since I got him. Hes only about a foot and a half long, in a 20 gallon tank, 90 degrees on 1 side, 80 on the other, 2 hides on each side, 60-70% humidity. The patches feel rough to the touch. He's a real sweetheart, eats regularly, and this is the only problem I have noticed since getting him. Any help on how this happens and can be stopped would be appreciated.