The biopsy really can only be taken during the rash b/c the biopsy HAS to be taken from CLEAR skin ADJACENT TO an active lesion. Read some of the posts on here in the dh forum. It will give you links to the proper way to take a dh biopsy AND PERHAPS MORE IMPORTANTLY how many derms screw it up even though they act like they know what they're doing! YOU need to be your own advocate & look over their shoulder & make sure they get it right or else you'll be frustrated & wondering perhaps forever. You don't want that! You have to be firm & print out how to take a dh biopsy the proper way & TAKE IT WITH YOU & SHOW IT TO THEM. Once in a while you come across a derm who knows what they're doing but the odds are against you okay? So take care of yourself by making sure it's done correctly the first time around.
AND I CAN'T STRESS THE FOLLOWING ENOUGH!
DO NOT stop eating gluten until the biopsy results are back. DO NOT eat gluten light until the biopsy results are back. DO NOT think you can go gluten-free & then eat some crackers a couple days before hand --- it will not work. And all of this applies until ALL testing is complete & results are in & you KNOW that everyone did everything right if you are going to have a celiac blood panel &/or endoscopy. And I will repeat what I've told a 1,000 times ---- celiacs with dh test neg. on blood & endoscopy more often than not. The antibodies are in our skin & that's what causes the high rate of false negatives on those tests.
AND topical steroid use or oral steroid use within roughly 2 months prior to dh biopsy will yield a false neg. biopsy. And I don't care WHAT the doctor says contrary to that.
Good luck & we sincerely hope you do not have celiac disease & especially dh!
But if you do --- we're here! Okay?