A DH diagnosis means a Celiac diagnosis. Here are some " reputable medical" sources you can show your doctor.
"Can a skin biopsy for dermatitis herpetiformis (DH) confirm celiac disease or is an endoscopy still needed?
A skin biopsy should be done on a non-affected portion of the skin near the rash when there is an outbreak. It’s not necessary to perform an intestinal biopsy to establish the diagnosis of celiac disease in a patient with DH; the skin biopsy is definitive."
"What is dermatitis herpetiformis?
Dermatitis herpetiformis (DH) is the skin manifestation of celiac disease. All patients with DH have celiac disease. It is an intensely itchy rash that usually occurs in the same place for each patient. This may be on the hands or fingers, forearms, buttocks or scalp or anywhere on the body. The rash typically consists of very itchy, small red dots that may develop into blisters or pimples. They are intensely itchy."
He refused to do the biopsy. He said it would be a waste to do one because he was 100% sure that it was DH based on my symptoms and from how it looks. Should I not trust his diagnosis since he didnt do a biopsy? Dangit, now I am even more confused.