Yellow Belly Scales

I've had my baby red tail boa for 3 months, and hes starting to develop few hard yellow belly scales. Anyone have any idea what this might be?

What type of substrate are you using? What is the humidity? And can you post a photo of the scales?

i use eco earth (compresses coconut fiber, made 4 reptiles) humidity is about 60- 70% depending on if hes in shed or not.

my computers a piece of :cens0r::cens0r::cens0r::cens0r:, not sure the pic will upload. if it does the scales r hard 2 c in a pic because hes so little.
http://pictures/jpeg kaa2
http://kaa2