This is Dr. David. I am reviewing your question now and will be with you momentarily.
these bumps could be early Dermatitis herpetiformis of the skin which can be seen in patients who have celiac disease
or they could be milia or subcutaneous keritin depositis
a skin biopsy could help with diagnosis.
this 12 year old patient sounds like he or she is suffering quite a bit.
let me know if you have questions.