ITA that the dermatologist isn't needed. Eczema is generally an allergy concern, not a skin concern. What I mean is, the derm. will treat symptoms and the allergist will treat the problem.
I have an HMO so I have to have a referral in order for insurance to pay. I had to ask the doctor for it and be firm that it was what I wanted. I got the lines that it couldn't be an allergy, that it would be painful, yada, yada, yada. DS didn't notice the back test and barely fussed for the bloo draw (he also had the RAST done before the allergist referral)