I have those same hand blisters and am currently being tested for celiac (gluten allergy) as well as having an allergy test to see if it is just a wheat allergy. Eczema is usually a direct link to an allergy of some sort. The poor thing, I know how itchy, painful and debilitating it is. Could you possibly mention this information to the parents? There is now a blood test to screen for celiac before doing the biopsy.