A gluten-free diet may help reduce the rash of dermatitis herpetiformis. Gluten is a chemical normally present in most breads and many other grain products. Always read food labels to avoid hidden sources of gluten.

Foods likely to contain gluten include:

• Distilled vinegar
• Malt
• Modified food starch
• Plant protein
• Soy sauce
• Vegetable protein

Corn and rice flour can be used as substitutes for conventional flour. Some restriction of dairy products may be required if a lactose deficiency is present. Vitamin and mineral supplements such as vitamin B12 and folate may be necessary in some cases.