Dermatitis Herpetiformis
What is Dermatitis Herpetiformis?
Dermatitis herpetiformis is a chronic skin condition that causes an intensely itchy, blistering rash. It is directly linked to gluten sensitivity and celiac disease. The rash typically appears on the elbows, knees, buttocks, back, and scalp. Despite the name, it has nothing to do with the herpes virus.
This condition is considered the skin manifestation of celiac disease. When people with dermatitis herpetiformis eat gluten, their immune system creates antibodies that attack the skin. The antibodies deposit in small blood vessels under the skin, triggering inflammation and blisters. About 15 to 25 percent of people with celiac disease develop dermatitis herpetiformis.
The rash comes and goes in cycles. Blisters often break before you notice them, leaving small erosions or crusts on the skin. The itching can be severe and disruptive to daily life. The good news is that a strict gluten-free diet can control symptoms and allow the skin to heal.
Symptoms
- Extremely itchy, burning, or stinging skin rash
- Small blisters or bumps that look like pimples or hives
- Red patches of skin where blisters have broken
- Rash appears symmetrically on both sides of the body
- Most common on elbows, knees, buttocks, lower back, and scalp
- Scratches and crusts from intense itching
- Skin discoloration or scarring in affected areas
- Digestive symptoms similar to celiac disease, such as bloating or diarrhea
Some people with dermatitis herpetiformis have no digestive symptoms at all. The skin rash may be the only sign of gluten sensitivity. Others experience mild intestinal damage without realizing it until tested.
Concerned about Dermatitis Herpetiformis? Check your levels.
Screen for 1,200+ health conditions
Causes and risk factors
Dermatitis herpetiformis is caused by an autoimmune reaction to gluten, a protein found in wheat, barley, and rye. When you eat gluten, your immune system mistakenly produces antibodies that attack your own tissues. These antibodies, particularly tissue transglutaminase and deamidated gliadin antibodies, deposit in the skin and trigger inflammation. The exact reason why some people develop the skin form while others only have intestinal celiac disease is not fully understood.
Genetics play a major role in who develops this condition. Most people with dermatitis herpetiformis carry specific genes called HLA-DQ2 or HLA-DQ8. Having these genes does not guarantee you will develop the condition, but it increases your risk. Family history of celiac disease or dermatitis herpetiformis also raises your likelihood. The condition typically begins in adulthood, most often between ages 30 and 40, though it can occur at any age.
How it's diagnosed
Dermatitis herpetiformis is diagnosed through a combination of skin biopsy and blood tests. A dermatologist will take a small sample of skin near the affected area and examine it under a microscope. The presence of IgA antibody deposits in the skin confirms the diagnosis. Blood tests measure antibodies associated with gluten sensitivity and celiac disease.
Rite Aid offers testing for gluten-related antibodies through our lab network at Quest Diagnostics. Our add-on tests include Tissue Transglutaminase IgA, Deamidated Gliadin Antibody IgA, and Gluten IgG. These markers help identify the autoimmune response to gluten that drives dermatitis herpetiformis. Testing before starting a gluten-free diet gives the most accurate results.
Treatment options
- Strict gluten-free diet eliminating wheat, barley, rye, and contaminated oats
- Dapsone medication to quickly control the rash and itching
- Topical corticosteroids for short-term relief of itching
- Working with a registered dietitian to ensure proper gluten-free nutrition
- Reading food labels carefully to avoid hidden gluten sources
- Monitoring for nutrient deficiencies common in celiac disease
- Regular follow-up with dermatology and gastroenterology specialists
- Avoiding iodine-rich foods if they trigger flare-ups
Need testing for Dermatitis Herpetiformis? Add it to your panel.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
The rash appears as small, extremely itchy blisters or bumps on red skin. It usually shows up symmetrically on both elbows, both knees, the buttocks, back, or scalp. The blisters often break from scratching, leaving crusts or erosions. The intense itching is often worse than the visible rash itself.
Dermatitis herpetiformis is considered the skin form of celiac disease. Both conditions involve an autoimmune reaction to gluten. Most people with the skin rash also have intestinal damage typical of celiac disease, even if they have no digestive symptoms. Treatment for both conditions is the same gluten-free diet.
Yes, many people with dermatitis herpetiformis have no noticeable digestive symptoms. The skin rash may be the only outward sign of gluten sensitivity. However, intestinal biopsies often reveal damage to the small intestine even without obvious symptoms. This is why following a gluten-free diet is important even if you feel fine digestively.
The rash typically takes several months to clear completely after starting a strict gluten-free diet. Some people see improvement within weeks, but full healing can take 6 months to 2 years. Medication like dapsone can control symptoms much faster, usually within days. Most people eventually reduce or stop medication once the diet takes full effect.
Blood tests measure antibodies related to gluten sensitivity and celiac disease. The most common tests include Tissue Transglutaminase IgA, Deamidated Gliadin Antibody IgA, and Gluten IgG. Elevated levels suggest an autoimmune reaction to gluten. These tests should be done before starting a gluten-free diet for accurate results.
Yes, dermatitis herpetiformis requires lifelong adherence to a gluten-free diet. Even small amounts of gluten can trigger the rash and intestinal damage. The good news is that strict avoidance allows the skin to heal and prevents complications. Many people find that after months or years on the diet, accidental gluten exposure causes less severe reactions.
Yes, untreated dermatitis herpetiformis can lead to the same complications as celiac disease. These include nutrient deficiencies, anemia, osteoporosis, and increased risk of certain cancers. The intestinal damage affects absorption of vitamins and minerals. Following a gluten-free diet reduces these risks significantly.
No, dermatitis herpetiformis is not contagious despite its appearance. It is an autoimmune condition caused by your own immune system reacting to gluten. You cannot spread it to others through skin contact or any other means. The name includes herpetiformis because the blisters resemble herpes, but there is no viral infection involved.
You must avoid all foods containing wheat, barley, rye, and most oats due to cross-contamination. This includes bread, pasta, cereals, baked goods, beer, and many processed foods. Read labels carefully for hidden gluten in sauces, soups, and seasonings. Some people also find that iodine-rich foods like seaweed can trigger flare-ups.
Your doctor may recommend repeat antibody testing 6 to 12 months after starting a gluten-free diet. Decreasing antibody levels confirm that you are successfully avoiding gluten. Annual testing can monitor your adherence and check for nutrient deficiencies. Regular blood work helps catch complications early and ensures your treatment plan is working.