Just found out from the manufacturer of the PPD Tuberculin skin test that there is no guarantee that is does not contain gluten. They had me give them a report with all my information to have on record. I had a reaction with reddness, itchy blisters and the infamous "bump". They retested me on the other arm and I had a worse reaction. Could be just a positive TB skin test, but I am wondering if there is gluten in this product. I do not have the DH that goes with celiac, but I do have celiac disease and have been gluten free for a year now. Anyone else out there with gluten issues and positive TB skin tests?