Intensely pruritic grouped vesicles on extensor surfaces; cutaneous manifestation of celiac disease.
Also known as: DH, Duhring disease, celiac skin disease, gluten-sensitive dermatitis
Overview
Chronic, intensely pruritic, autoimmune blistering disorder characterized by grouped (herpetiform) vesicles, papules, and excoriations on extensor surfaces. It is the specific cutaneous manifestation of gluten sensitivity and shares the same gluten-driven small bowel pathology as celiac disease in nearly all affected patients.
Epidemiology
Prevalence approximately 10-75 per 100,000 in populations of Northern European descent; rare in Asians and Africans. Peak onset 20-40 years; male predominance roughly 2:1. Strong HLA associations (HLA-DQ2 in ~90%, HLA-DQ8 in most remaining). Coexisting autoimmune disease in 20-30% (thyroid disease, type 1 diabetes, pernicious anemia).
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First-degree relative with celiac disease or dermatitis herpetiformis
Other autoimmune disease (Hashimoto thyroiditis, type 1 DM)
Pathophysiology
Ingested gluten is deamidated by tissue transglutaminase (tTG) in the gut. IgA autoantibodies form against epidermal transglutaminase (TG3), the cutaneous isoform, and these IgA-TG3 immune complexes deposit at the tips of dermal papillae. Complement activation and neutrophil recruitment produce microabscesses at the dermal papillary tips and subepidermal vesiculation.
Clinical presentation
Symptoms
Severe, often unbearable, pruritus and burning that may precede visible lesions
Symmetric grouped vesicles, papules, and excoriations on extensor elbows, knees, buttocks, scalp, and posterior shoulders
Many patients have no overt GI symptoms despite enteropathy; some report bloating, diarrhea, or steatorrhea
Improvement with gluten avoidance, flare with gluten challenge
Signs / physical exam
Erythematous urticarial papules with overlying excoriations; intact vesicles often absent because itch leads to rapid rupture
Symmetric distribution on extensor surfaces is highly characteristic
Signs of nutrient malabsorption (iron-deficiency anemia, low vitamin D) in some patients
Classic findings
Excoriated extensor papulovesicles in a young adult with the IgA-TG3 / HLA-DQ2 axis.
Differential diagnosis
Atopic dermatitis — Flexural pruritic eczema, personal/family atopy, no vesicles or granular IgA; responds to topical steroids and emollients
Scabies — Burrows in webspaces, wrists, genitals; intense nocturnal itch; household contacts affected; mite or eggs on skin scraping
Bullous pemphigoid — Elderly, tense bullae on flexural skin, linear IgG/C3 at BMZ; no gluten relationship
Linear IgA bullous dermatosis — Annular 'string of pearls' tense vesicles; linear (not granular) IgA along basement membrane; often drug-induced (vancomycin)
Papular urticaria / arthropod reaction — Crops of pruritic papules in exposed sites, seasonal, no granular IgA on DIF
Diagnostic workup
Diagnostic criteria
Perilesional skin direct immunofluorescence showing granular IgA deposits at the dermal papillary tips is the diagnostic gold standard. Supportive findings: histology with neutrophilic microabscesses in dermal papillae and subepidermal split; positive celiac serology; HLA-DQ2 or HLA-DQ8.
Labs
Serum IgA anti-tissue transglutaminase (tTG) — first-line serologic test, also positive in celiac
Anti-endomysial IgA and anti-deamidated gliadin peptide IgA/IgG as adjuncts
Anti-epidermal transglutaminase (TG3) IgA when available — more specific for DH
Total serum IgA (rule out IgA deficiency that produces false-negative serology)
CBC, ferritin, vitamin D, B12, folate to evaluate for malabsorption
TSH and fasting glucose to screen for associated autoimmune disease
Imaging
No imaging required for the skin disease itself
Upper endoscopy with small bowel biopsy when serology and clinical suspicion warrant, particularly to confirm enteropathy
Diagnostic algorithm
Feature
Dermatitis Herpetiformis
Bullous Pemphigoid
Linear IgA Disease
Typical age
20-40
>70
Children or adults
Distribution
Extensor (elbows, knees, buttocks)
Flexural, trunk
Variable; perineum in kids
Symptom
Severe itch/burning
Severe itch
Itch
Lesion morphology
Grouped vesicles, excoriations
Tense bullae on urticarial base
Annular 'string of pearls'
DIF pattern
Granular IgA, dermal papillae tips
Linear IgG/C3 at BMZ
Linear IgA at BMZ
Associated disease
Celiac (>90%)
Neurologic disease, DPP-4i
Drugs (vancomycin)
First-line therapy
Gluten-free diet + dapsone
Topical/oral steroids ± doxycycline
Stop trigger; dapsone
Distinguishing dermatitis herpetiformis from other subepidermal/IgA-mediated blistering diseases.
Treatment
First-line
Strict lifelong gluten-free diet — the only disease-modifying therapy; reverses both skin and gut disease over months and reduces lymphoma risk
Dapsone 25-50 mg/day titrated to 100-200 mg/day for rapid pruritus and lesion control while diet takes effect; screen G6PD before starting; monitor CBC, reticulocytes, methemoglobin, LFTs
Patient education and registered dietitian referral to identify hidden gluten sources
Second-line / adjunct
Sulfapyridine or sulfasalazine in patients intolerant of dapsone
Topical corticosteroids for symptomatic relief of individual lesions (adjunct only)
Antihistamines for pruritus (limited efficacy)
Dapsone is typically tapered and discontinued after years of strict gluten avoidance once lesions are quiescent
Complications
Persistent pruritus and post-inflammatory hyperpigmentation
Nutritional deficiencies from associated enteropathy (iron, B12, folate, vitamin D)
Small bowel lymphoma (enteropathy-associated T-cell lymphoma) risk — substantially reduced by strict gluten-free diet
Associated autoimmune disease (thyroid, type 1 DM, pernicious anemia)
PANCE pearls
DH and celiac share the same gut pathology in essentially all patients; consider DH the cutaneous expression of celiac disease.
Granular IgA at the tips of dermal papillae on perilesional DIF is the diagnostic gold standard.
Dapsone relieves itch in 24-48 hours and can be a 'therapeutic clue' to the diagnosis, but it does not treat the underlying enteropathy.
Always check G6PD before starting dapsone to avoid severe hemolysis.
Gluten avoidance is lifelong; even small amounts of gluten can flare the skin disease.
Iodide-containing supplements and contrast may flare DH lesions — distinct from the gluten-driven mechanism.
References
AAD 2021 — Guidelines of care for the management of dermatitis herpetiformis (Bolotin & Petronic-Rosic, JAAD 2011; updated reviews)
ACG Celiac 2023 — American College of Gastroenterology Clinical Guideline: Diagnosis and Management of Celiac Disease (Rubio-Tapia et al., Am J Gastroenterol 2023)
British Association of Dermatologists — Guidelines for the management of dermatitis herpetiformis (Hervonen et al., BJD 2022)
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