Dermatitis herpetiformis: information for patients

A clear guide to a gluten-related skin condition that can be mistaken for eczema, allergies, or herpes.

Summary in 60 seconds

• Dermatitis herpetiformis is an inflammatory skin disease associated with gluten sensitivity and considered a cutaneous manifestation of celiac disease.
• It’s not herpes, even though its name might suggest it. It’s called «herpetiform» because the lesions can cluster together like small blisters.
• It usually causes very intense itching, burning and lesions in areas such as elbows, knees, buttocks, upper back, scalp or nape of the neck.
• Many people do not have obvious digestive symptoms, although intestinal involvement may exist.
• The diagnosis is usually confirmed with a skin biopsy and a special test called direct immunofluorescence.
• The basic treatment is a strict gluten-free diet, ideally accompanied by specialized nutrition.
• In some cases, dapsone is used to quickly control itching and lesions, but it requires analysis and medical supervision.
• It is not advisable to self-medicate or start drastic dietary changes without a clear diagnostic strategy.
• With proper diagnosis, specialized medical follow-up, and adherence, control is usually favorable.

What is dermatitis herpetiformis?

Dermatitis herpetiformis is a chronic, autoimmune skin disease related to gluten. It is considered a skin manifestation of celiac disease: the immune system reacts to gluten, leading to deposits of immunoglobulin A in the skin, which promote inflammation, itching, and small blisters. Nguyen 2021

Despite its name, it is not a herpes infection . The word «herpetiform» describes the clustered appearance of some blisters, not their cause. DermNet also emphasizes that it is not due to a viral infection . (DermNet 2023)

Dermatitis herpetiformis is seen on the skin, but its evaluation should also look at the gut, nutrition, and immune system.

Why does it appear?

It appears in people with a genetic and immunological predisposition to react to gluten, a protein found in wheat, barley, and rye. Dermatitis herpetiformis and celiac disease share mechanisms, although not everyone experiences diarrhea, abdominal pain, or weight loss.

Simply put: the problem isn’t just skin-related. The skin reflects a broader immune response associated with gluten. Therefore, European guidelines recommend also assessing the digestive and nutritional aspects. Görög 2021

It can be mistaken for eczema, scabies, hives, insect bites, folliculitis, or some autoimmune blistering diseases. This is one of the reasons why a medical diagnosis is important and should not be based solely on photographs or a home «gluten removal» test.

What does it look like and what symptoms does it cause?

The most characteristic symptom is intense itching , sometimes with a burning or stinging sensation, before the lesions appear. Small blisters, pimples, scabs, or scratching erosions may be visible. Often, the blisters rupture quickly, so patients tend to seek medical attention more for scabs and marks than for intact blisters.

The classic zones are:

• Elbows and forearms.
• Knees.
• Buttocks.
• Upper back.
• Nape and scalp.
• Hairline.

The distribution is usually quite symmetrical: for example, both elbows or both knees. This symmetry does not confirm the diagnosis on its own, but it is suggestive. Clinical reviews describe dermatitis herpetiformis as a typical itchy, blistering rash on the elbows, knees, and buttocks. Reunala 2021

What can you do today?

If you suspect dermatitis herpetiformis, it’s best to consult a dermatologist. Taking clear photos, noting when outbreaks occur, and documenting any correlation with foods, medications, or supplements can be helpful.

While you wait for an evaluation, it’s usually wise to take care of your skin barrier: take lukewarm showers, use gentle cleansers, moisturize with emollients, keep your nails short, and avoid intense scratching. Cold compresses can provide temporary relief from itching.

An important point: if you haven’t yet been diagnosed, it’s not advisable to start a strict gluten-free diet without speaking to your doctor , as this can alter the results of celiac disease tests and make confirmation more difficult. Celiac disease guidelines recommend performing diagnostic evaluation with adequate gluten exposure whenever clinically possible. Rubio-Tapia 2023

If the diagnosis is already confirmed, the cornerstone of treatment is a sustained gluten-free diet, ideally with nutritional support. The British Association of Dermatologists notes that the diet may take time to have an effect on the skin, but it helps control skin and intestinal symptoms. BAD 2023

What NOT to do?

Don’t assume it’s herpes or use antiviral medications without a doctor’s prescription. Dermatitis herpetiformis is not a herpes infection.

Do not self-medicate with dapsone. It can be very useful, but requires prior testing and medical monitoring because it can cause hemolytic anemia, methemoglobinemia, and other adverse effects. European guidelines recommend assessing G6PD, complete blood count, and liver/kidney function before and during treatment. Görög 2021

Do not use strong corticosteroids for weeks without supervision. They may provide relief, but they are not a substitute for diagnosis or treatment of the underlying cause.

Don’t use a gluten-free diet «trial» as the sole method of diagnosis. Improvement after gluten removal can be helpful, but it doesn’t confirm dermatitis herpetiformis on its own.

Do not ignore general symptoms such as marked fatigue, weight loss, anemia, persistent diarrhea, abdominal pain, or fragility fractures, because they may indicate celiac disease or another associated condition.

When should I consult?

Consult a dermatology specialist if you have intense itching and repeated lesions on your elbows, knees, buttocks, neck, or scalp, especially if they are symmetrical or recurring.

Seek prompt medical attention if any of these signs appear:

• Extensive blisters or rapidly expanding lesions.
• Severe pain, pus, fever, or general malaise.
• Yellowish scabs, local heat, or signs of infection.
• Weight loss, persistent diarrhea, anemia, or severe fatigue.
• Pregnancy, childhood, or known immunological disease.
• Shortness of breath, bluish lips, severe dizziness, fever, bruising or paleness if you are taking dapsone.
• Injuries near the eyes, mouth, or genitals.

What does a dermatologist usually do?

The dermatologist reviews the distribution of the lesions, the intensity of the itching, family history of celiac disease or autoimmunity, digestive symptoms, and medications.

To confirm the diagnosis, a skin biopsy is usually requested. In dermatitis herpetiformis, two approaches are used: a biopsy of a lesion for histology and another of nearby, apparently healthy skin for direct immunofluorescence. The latter looks for granular deposits of IgA and is considered a key test, even the «gold standard» in European guidelines. Görög 2021

Blood tests related to celiac disease may also be ordered. In some cases, a gastroenterology evaluation, endoscopy, or intestinal biopsy is indicated, depending on age, symptoms, test results, and clinical context.

Treatment typically combines three pillars: a gluten-free diet, skin monitoring, and follow-up. Dapsone can relieve itching in a few days, but it does not replace a gluten-free diet or correct the underlying intestinal immune system. Görög 2021

A gluten-free diet is not a therapeutic fad in confirmed dermatitis herpetiformis: it is a central part of medical treatment.

Frequently Asked Questions

Is dermatitis herpetiformis viral herpes?

• No. The name can be misleading, but it’s not herpes and it’s not considered a contagious infection. «Herpetiform» describes the clustered appearance of the blisters.

Are there always digestive symptoms?

• No. Many people have few or no digestive symptoms, although intestinal involvement consistent with celiac disease may be present. Therefore, the examination should not be limited to the skin.

Does a gluten-free diet cure dermatitis herpetiformis?

• A gluten-free diet is the primary treatment and can control the disease, reduce flare-ups, and decrease the need for medication. However, it is often considered a chronic condition: if gluten is reintroduced, the lesions can return.

How long does it take for the skin to improve?

• Dapsone can improve itching within a few days in many patients, but a gluten-free diet takes longer to have a noticeable effect on the skin. European guidelines describe that the full effect of the diet on skin manifestations can take months, sometimes between 6 and 24 months.

Can I start taking dapsone on my own?

• No. Dapsone requires a prescription, prior tests, and regular checkups. It is not a cosmetic medication or an antihistamine.

Do corticosteroid creams work?

• They can help relieve itching or inflammation in selected cases, but they do not replace a gluten-free diet or diagnostic confirmation.

Should I see a gastroenterologist?

• Often, yes, especially if there is suspected or confirmed celiac disease, anemia, digestive symptoms, nutritional deficiencies, or questions about follow-up. Ideal management may include dermatology, gastroenterology, and nutrition.

Bibliography and sources

• Görög A, Antiga E, Caproni M, Cianchini G, De D, Dmochowski M, et al. S2k guidelines consensus statement for diagnosis and therapy of dermatitis herpetiformis initiated by the European Academy of Dermatology and Venereology . J Eur Acad Dermatol Venereol. 2021;35(6):1251-1277. doi:10.1111/jdv.17183.
• Nguyen CN, Kim SJ. Dermatitis Herpetiformis: An Update on Diagnosis, Disease Monitoring, and Management . Medicine (Kaunas). 2021;57(8):843. doi:10.3390/medicine57080843.
• Reunala T, Hervonen K, Salmi T. Dermatitis Herpetiformis: An Update on Diagnosis and Management . Am J Clin Dermatol. 2021;22(3):329-338. doi:10.1007/s40257-020-00584-2.
• Antiga E, Caproni M. The diagnosis and treatment of dermatitis herpetiformis . Clin Cosmet Investig Dermatol. 2015;8:257-265. doi:10.2147/CCID.S69127.
• Zingone F, Maimaris S, Auricchio R, Caio GPI, Carroccio A, Elli L, et al. Guidelines of the Italian societies of gastroenterology on the diagnosis and management of coeliac disease and dermatitis herpetiformis . Dig Liver Dis. 2022;54(10):1304-1319. doi:10.1016/j.dld.2022.06.023.
• Rubio-Tapia A, Hill ID, Semrad C, Kelly CP, Greer KB, Limketkai BN, et al. American College of Gastroenterology Guidelines Update: Diagnosis and Management of Celiac Disease . Am J Gastroenterol. 2023;118(1):59-76. doi:10.14309/ajg.0000000000002075.
• Husby S, Koletzko S, Korponay-Szabó IR, Kurppa K, Mearin ML, Ribes-Koninckx C, et al. European Society Pediatric Gastroenterology, Hepatology and Nutrition Guidelines for Diagnosing Coeliac Disease 2020 . J Pediatr Gastroenterol Nutr. 2020;70(1):141-156. doi:10.1097/MPG.0000000000002497.
• British Association of Dermatologists. Dermatitis herpetiformis gluten sensitivity: patient information leaflet . London: British Association of Dermatologists; 2023.
• DermNet NZ. Dermatitis herpetiformis: features, diagnosis, and treatment . DermNet New Zealand; updated 2026.
• Kurien G, Jamil RT, Preuss CV. Dapsone . In: StatPearls. Treasure Island (FL): StatPearls Publishing; 2024.