Hi. Hard to tell for me. Could you try this little trick? Give him a nice warm bath, when you take him out hold him in your hand with his head near your fingers, tail laying down your arm. Pull up the tail with the other hand. I find if you gently rub the area where the bumps should be, they might come up. Get someone to take the picture over your shoulder. May sound a bit much here... but it worked for me (when I couldn't see anything). Good luck.