Dermatitis Herpetiformis

Dermatitis Herpetiformis

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Dermatitis herpetiformis is an exquisitely pruritic eruption classically seen on the buttocks and the extensor surfaces of the arms and legs. Severe cases may involve larger surface areas.

Dermatitis herpetiformis is an autoimmune blistering disorder that is often associated with a gluten-sensitive enteropathy (GSE). The disease was described and named in 1884 by Dr. Louis Duhring at the University of Pennsylvania. [1] It is also known as Duhring disease or Duhring-Brocq disease. [54]

Dermatitis herpetiformis is characterized by grouped excoriations, erythematous, urticarial plaques, and papules with vesicles. The classic location for dermatitis herpetiformis lesions is on the extensor surfaces of the elbows, knees, buttocks, and back. It is extremely pruritic, and the vesicles are often excoriated to erosions by the time of physical examination, as shown in the image below.

See Autoimmune Disorders: Making Sense of Nonspecific Symptoms, a Critical Images slideshow, to help identify several diseases that can cause a variety of nonspecific symptoms.

Diagnosis requires direct immunofluorescence of a skin biopsy specimen showing deposition of immunoglobulin A (IgA) in a granular pattern in the upper papillary dermis. Although most patients are asymptomatic, greater than 90% have an associated gluten-sensitive enteropathy upon endoscopic examination. [55] Among patients with celiac disease, 15-25% develop dermatitis herpetiformis. The mainstays of treatment are dapsone and a gluten-free diet. A vertically oriented fibrillar staining pattern is noted in a subset of patients, with immune deposits along dermal microfibrils, creating a characteristic “picket fence” pattern of immunofluorescence. This fibrillar pattern is present in a third of Japanese patients, and this group lacks the typical distribution of skin lesions and has a low association with celiac disease. [2]

Dermatitis herpetiformis is a disease of the skin caused by the deposition of IgA in the papillary dermis, which triggers an immunologic cascade, resulting in neutrophil recruitment and complement activation. Dermatitis herpetiformis is the result of an immunologic response to chronic stimulation of the gut mucosa by dietary gluten. [3]

An underlying genetic predisposition to the development of dermatitis herpetiformis has been demonstrated. Both dermatitis herpetiformis and celiac disease (CD) are associated with an increased expression of HLA-A1, HLA-B8, HLA-DR3, and HLA-DQ2 haplotypes. Environmental factors are also important; monozygotic twins may have dermatitis herpetiformis, celiac disease, and/or gluten-sensitive enteropathy with variable symptomatology.

The leading theory for dermatitis herpetiformis is that a genetic predisposition for gluten sensitivity, coupled with a diet high in gluten, leads to the formation of IgA antibodies against gluten-tissue transglutaminase (t-TG), which is found in the gut. These antibodies cross-react with epidermal transglutaminase (e-TG). [4] eTG is highly homologous with tTG. Serum from patients with gluten-sensitive enteropathy, with or without skin disease, contains IgA antibodies to both skin and gut types. [5] Deposition of IgA and epidermal TG complexes in the papillary dermis cause the lesions of dermatitis herpetiformis.

In patients with gluten-sensitive enteropathy, levels of circulating antibodies to tissue and epidermal transglutaminase have been found to correlate with each other, and both appear to correlate with the extent of enteropathy. [6]

Co-localized IgA and eTG deposits have been demonstrated in the papillary dermis in patients with dermatitis herpetiformis and, to lesser extent, in the healthy skin of gluten-sensitive enteropathy patients. [7] eTG has not been demonstrated in normal papillary dermis, suggesting it is part of the circulating complex that is deposited in the papillary dermis, rather than originating from the papillary dermis.

Cutaneous IgA deposits in dermatitis herpetiformis have been shown to function in vitro as a ligand for neutrophil migration and attachment. Although IgA deposition is pivotal for disease, an increased serum IgA is not necessary for pathogenesis; in fact, case reports describe dermatitis herpetiformis in patients with a partial IgA deficiency. [8] When the disease is active, circulating neutrophils have a higher level of CD11b and an increased ability to bind IgA. The characteristic histologic finding of dermatitis herpetiformis is neutrophil accumulation at the dermoepidermal junction, frequently localizing to the papillary tips of the basement membrane zone.

Interleukin 8 (IL-8) is a potent neutrophil activator; gluten, UVB exposure, and trauma have all been shown to induce IL-8 production. [9] It has been demonstrated that dietary gluten increases levels of serum IL-8 in patients with dermatitis herpetiformis. A study in transgenic mice expressing IL-8 in the intestine has been shown to increase local neutrophil migration into the area.

Collagenase and stromelysin 1 may be induced in basal keratinocytes either by cytokines released from neutrophils or by contact with keratin from damaged basement membrane matrix. Stromelysin 1 may contribute to blister formation.

One study found levels of E-selectin mRNA expression in normal-appearing skin of patients with dermatitis herpetiformis to be 1271 times greater that that of controls. [10] Additionally, the same study observed increased soluble E-selectin, IgA antitissue transglutaminase antibodies, tumor necrosis factor-alpha, and serum interleukin 8 (IL-8) levels in patients with dermatitis herpetiformis, providing further evidence of endothelial cell activation and a systemic inflammatory response as part of the pathogenic mechanism of the disease. Mild local trauma may also induce the release of cytokines and attract the partially primed or activated neutrophils, which is consistent with the typical location of dermatitis herpetiformis lesions on frequently traumatized areas, such as the knees and elbows.

Deposits of C3 also may be present in a similar pattern at the dermoepidermal junction. The membrane attack complex, C5-C9, also has been identified in perilesional skin, although it may be inactive and not contribute to cell lysis. [11]

A recent study showed an increased expression of disintegrin and metalloproteinase (ADAMs) 8, 10, 15, and 17 in lesional skin of patients with dermatitis herpetiformis compared with controls. The high affinity of ADAMs for the basement membrane led the authors to hypothesize a role in blister formation in dermatitis herpetiformis. [12]

Hormonal factors may also play a role in the pathogenesis of dermatitis herpetiformis, and reports describe dermatitis herpetiformis induced by treatment with leuprolide acetate, a gonadotropin-releasing hormone analog. [13] Androgens have a suppressive effect on immune activity, including decreased autoimmunity, and androgen deficient states may be a potential trigger for dermatitis herpetiformis exacerbation. Exacerbation of dermatitis herpetiformis by oral contraceptives has also been reported.

Apoptosis may contribute to the pathogenesis of epidermal changes in dermatitis herpetiformis, and research demonstrates a markedly increased apoptotic rate within the epidermal compartment in dermatitis herpetiformis. [14] In addition, Bax and Bcl-2 proteins are increased in the dermal perivascular compartment and Fas proteins showed epidermal staining in dermatitis herpetiformis lesions.

Most patients with dermatitis herpetiformis have histologic evidence of enteropathy, even in the absence of symptoms of malabsorption. In one study, all dermatitis herpetiformis patients had increased intestinal permeability (as measured by the lactulose/mannitol ratio) and up-regulation of zonulin, a regulator of tight junctions. [15] Thus, increased expression of zonulin may be involved in the pathogenesis of enteropathy in patients with dermatitis herpetiformis.

Keratinocytes express elafin to down-regulate neutrophil-mediated inflammatory responses. Patients with dermatitis herpetiformis have deficient expression of elafin. [56]

Dermatitis herpetiformis is generally accepted as a cutaneous manifestation of celiac disease. The genetic predisposition to the development of gluten sensitivity underlies the disease.

Gluten is a protein present in grasses of the species Triticeae, which includes barley, rye, and wheat. Gliadin protein in these grains are high-affinity substrates for tissue transglutaminase (TTG). Gliadins can also be found in rice, corn, and oats, but these proteins are poor substrates for TTG and thus these tend to be tolerated. Buckwheat is also tolerated. [22, 23] Strict compliance with a gluten-free diet results in normalization of the small bowel mucosal changes and control of the cutaneous manifestations of dermatitis herpetiformis in most patients. levels of circulating antibodies also tend to normalize.

Although cornstarch does not contain gluten, 2 case reports describe patients with well-controlled dermatitis herpetiformis who had disease flares after ingesting cornstarch. [24]

The gluten-sensitive enteropathy does not cause symptoms in most dermatitis herpetiformis patients. Less than 10% exhibit symptoms of bloating, diarrhea, or malabsorption. However, greater than 90% show abnormalities upon endoscopic examination. Two thirds have villous atrophy detected on intestinal biopsy specimens. The other third shows elevated intraepithelial lymphocyte counts, increased T-cell receptor gamma/delta intraepithelial lymphocyte counts, or both.

The critical role of associated gluten-sensitive enteropathy in the pathogenesis of dermatitis herpetiformis is confirmed by the fact that resumption of a gluten-containing diet in patients with dermatitis herpetiformis results in a return of the characteristic skin disease.

Mild steatorrhea or other signs of mild malabsorption (eg, altered D-xylose absorption, iron or folate deficiency) can be demonstrated in 20-30% of patients with dermatitis herpetiformis.

Patients with dermatitis herpetiformis and no apparent GI disease can be induced into developing dermatitis herpetiformis by increasing gluten intake, which is often termed latent gluten-sensitive enteropathy.

IgA circulating immune complexes are present in 25-35% of patients with dermatitis herpetiformis, although no association with disease severity has been noted. These immune complexes also have been noted in patients with isolated gluten-sensitive enteropathy and are believed to be related to the presence of the gut disease. [6]

IgA antibodies to gliadin (a portion of wheat protein), reticulum, and smooth muscle endomysium have also been noted in patients with dermatitis herpetiformis and in those with isolated gluten-sensitive enteropathy.

IgA endomysial antibodies are most specific for gluten sensitivity and are found in 80% of patients with dermatitis herpetiformis and greater than 95% of patients with celiac disease. The presence of IgA antiendomysial antibodies correlates with the extent of the gut disease; [6, 25] however, some dermatitis herpetiformis patients do not have detectable IgA antiendomysial antibodies, even during episodes of active skin disease.

The criterion standard for the diagnosis of dermatitis herpetiformis remains the presence of granular deposits of IgA in normal-appearing perilesional skin. It is positive in 92.4% of patients.

Patients with bullous pemphigoid, [26]  cicatricial pemphigoid, Henoch-Schönlein purpura, and alcoholic liver disease also may have IgA deposits in normal skin; however, the pattern of IgA deposits is different from that seen in patients with dermatitis herpetiformis.

In patients with dermatitis herpetiformis, 10-15% of their first-degree relatives have dermatitis herpetiformis or celiac disease. HLA studies have conclusively established the presence of a genetic predisposition for dermatitis herpetiformis. Patients with dermatitis herpetiformis have an increased expression of the HLA-A1, HLA-B8, HLA-DR3, and HLA-DQ2 haplotypes. This is identical to the HLA association found in patients with isolated gluten-sensitive enteropathy. Most persons with these HLA types do not have dermatitis herpetiformis or gluten-sensitive enteropathy. Associations of HLA and dermatitis herpetiformis are as follows:

For HLA-B8, the association with dermatitis herpetiformis is 58-87%, versus 20-30% for control patients.

For HLA-DR3, the association with dermatitis herpetiformis is 90-95%, versus 23% for control patients.

For HLA-DQ2, the association with dermatitis herpetiformis is 95-100%, versus 40% for control patients.

Other associations include the following:

Associated GI conditions include gluten enteropathy, gastric atrophy, gastric hypochlorhydria, and pernicious anemia.

Associated autoimmune diseases include dermatomyositis, type 1 diabetes mellitus, myasthenia gravis, rheumatoid arthritis, Sjögren syndrome, systemic lupus erythematosus, and thyroid abnormalities. Thyroid abnormalities are present in as many as 50% of dermatitis herpetiformis patients and include hypothyroidism, hyperthyroidism, thyroid nodules, and thyroid cancer. [27]

Neurologic manifestations such as ataxia have been rarely described. [28]

Associated neoplastic conditions include GI lymphomas and non-Hodgkin lymphoma; patients are at increased risk of developing these cancers. [29] A gluten-free diet may reduce the incidence of dermatitis herpetiformis–associated lymphomas.

Celiac disease usually involves more severe and widespread intestinal involvement. Celiac disease has been associated with genetic abnormalities, including Down syndrome, Turner syndrome, and William syndrome. Liver disease, neurologic disorders, and other skin diseases are also increased in celiac disease, possibly due to common HLA regions on chromosome 6 or immune molecule cross-reactivity.

Gastric manipulation (surgery) may induce dermatitis herpetiformis.

Several chemicals have been associated with induction of dermatitis herpetiformis, including potassium iodide and cleaning solutions.

Case reports have described dermatitis herpetiformis induced by medications. Leuprolide acetate, inhibitors of tumor necrosis factor-alpha, anti-influenza medications, and progesterone-containing contraceptives have been reported in association with development of dermatitis herpetiformis. [13, 30]

United States

The only US study showed a dermatitis herpetiformis prevalence of 11.2 cases per 100,000 population.


Prevalence of dermatitis herpetiformis has been reported as high as 10 cases per 100,000 population.

Dermatitis herpetiformis occurs more frequently in individuals of Northern European ancestry and is rare in Asians and persons of African descent. Dermatitis herpetiformis is most common in Ireland and Sweden. This can be attributed to the shared HLA associations of dermatitis herpetiformis and celiac disease including DQA1*0501 and B1*-02, which encode HLA-DQ2 heterodimers.

US studies show a male-to-female ratio of 1.44:1, but international studies have demonstrated a male-to-female ratio up to 2:1. In one study of patients with gluten-sensitive enteropathy, 16% of the men and 9% of the women had dermatitis herpetiformis. [16]

Typically, the onset of dermatitis herpetiformis is in the second to fourth decade; however, persons of any age may be affected. [17] Dermatitis herpetiformis is rare in children.

Dermatitis herpetiformis (DH) is an ongoing disease process of variable severity. The prognosis is good for patients who can tolerate dapsone and the few who can maintain a gluten-free diet (which may decrease the risk of lymphoma).

In an English study, patients with dermatitis herpetiformis (152 total) were followed from the date of diagnosis to the end of 1989 for mortality and from 1971 or the date of diagnosis (if later) to 1986 for cancer incidence. [18] Death occurred in 38 patients younger than 85 years, slightly fewer than expected on the basis of national general population rates. Cancer incidence was significantly increased. Cancer of the small intestine caused 1 death, and lymphoma caused 1 death. Another English study, which compared 846 dermatitis herpetiformis patients with 4225 controls, found that dermatitis herpetiformis conferred no increased risk of lymphoproliferative cancer and no increase in fracture, malignancy, or mortality. [19]

A 30-year population-based study of 1147 celiac disease and dermatitis herpetiformis patients in Finland also revealed an overall good prognosis for patients with dermatitis herpetiformis. [20] The total occurrence of malignancies was equal to that of the general population in both celiac disease and dermatitis herpetiformis patients, but an increased incidence of lymphoma was noted among both celiac disease and dermatitis herpetiformis patients, with standardized incidence ratios of 3.2 and 6.0, respectively. Most were T-cell lymphomas, although B-cell lymphoma has occurred as well. Interestingly, a lower incidence of lymphoma was seen in the first-degree relatives of dermatitis herpetiformis patients. [21] Overall mortality was actually decreased in dermatitis herpetiformis patients compared with that in the general population.

Dermatitis herpetiformis lesions are extremely pruritic. Morbidity results from scarring, discomfort, and insomnia due to itching. Secondary infection may also develop, requiring antibiotic therapy.

Educate patients regarding the use of a gluten-free diet as well as the adverse effects and complications of dapsone.

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Jami L Miller, MD Assistant Professor, Division of Dermatology, Department of Internal Medicine, Vanderbilt University Medical School; Director of Phototherapy Unit, Vanderbilt University Medical Center; Consulting Attending Physician, Nashville Veterans Affairs Medical Center

Jami L Miller, MD is a member of the following medical societies: American Academy of Dermatology, American College of Physicians, American Medical Association

Disclosure: Nothing to disclose.

Shehnaz Aysha K Zaman, MD Resident Physician, Department of Dermatology, Vanderbilt Medical Center

Disclosure: Nothing to disclose.

Michael J Wells, MD, FAAD Dermatologic/Mohs Surgeon, The Surgery Center at Plano Dermatology

Michael J Wells, MD, FAAD is a member of the following medical societies: Alpha Omega Alpha, American Academy of Dermatology, American Medical Association, Texas Medical Association

Disclosure: Nothing to disclose.

Julia R Nunley, MD Professor, Program Director, Dermatology Residency, Department of Dermatology, Virginia Commonwealth University Medical Center

Julia R Nunley, MD is a member of the following medical societies: American Academy of Dermatology, American College of Physicians, American Society of Nephrology, International Society of Nephrology, Medical Dermatology Society, Medical Society of Virginia, National Kidney Foundation, Phi Beta Kappa, Women’s Dermatologic Society

Disclosure: Serve(d) as a director, officer, partner, employee, advisor, consultant or trustee for: American Board of Dermatology<br/>Co-Editor for the text Dermatological Manifestations of Kidney Disease .

Dirk M Elston, MD Professor and Chairman, Department of Dermatology and Dermatologic Surgery, Medical University of South Carolina College of Medicine

Dirk M Elston, MD is a member of the following medical societies: American Academy of Dermatology

Disclosure: Nothing to disclose.

Russell Hall, MD J Lamar Callaway Professor And Chair, Department of Dermatology, Duke University Medical Center, Duke University School of Medicine

Russell Hall, MD is a member of the following medical societies: American Academy of Dermatology, American Federation for Medical Research, American Society for Clinical Investigation, Society for Investigative Dermatology

Disclosure: Received consulting fee from Novan for consulting; Received consulting fee from Stieffel, a GSK company for consulting; Received salary from Society for Investigative Dermatology for board membership.

The authors and editors of Medscape Reference gratefully acknowledge the contributions of previous authors, Kristina Collins, MD, and Hunter Sams, MD, to the development and writing of this article.

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