Dyshidrotic Eczema Less Tied to Occupation Than Other Hand Eczema

Dyshidrotic eczema behaves differently from other forms of hand eczema in ways that matter for how it is worked up and treated, according to the largest registry analysis of the condition to date, published in Contact Dermatitis.¹

A Distinct Vesicular Pattern

Dyshidrotic eczema, also called acute and recurrent vesicular dermatitis or pompholyx, is a vesicular clinical pattern of hand eczema marked by intensely itchy blisters, typically on the palms, soles, or sides of the fingers.² Its causes are heterogeneous, and whether it should be worked up and managed the same way as other hand eczema subtypes has remained unclear, in part because large comparative datasets have been scarce.

Researchers turned to the Spanish Registry of Research in Contact Dermatitis and Cutaneous Allergy (REIDAC) to characterize the epidemiological, clinical, and allergic profile of patients with dyshidrotic eczema and compare it directly with other hand eczema subtypes.¹

The multicenter, retrospective, observational study drew on data from the Spanish Contact Dermatitis Registry collected between 2019 and 2024. Of 4378 total patients with hand eczema captured in the registry, 559 were diagnosed with dyshidrotic eczema, allowing direct statistical comparison against the larger non–dyshidrotic eczema hand eczema group drawn from the same registry and time period.

Longer Duration, Fewer Occupational Triggers, No Clear Cause in Most Cases

Patients with dyshidrotic eczema had a longer median disease duration than those with other hand eczema subtypes (24 vs 14 months) and more frequent palmoplantar involvement (16% vs 7%). At least 1 positive patch test was identified in 43% of patients with dyshidrotic eczema compared with 52% of those with other hand eczema, a gap driven partly by lower sensitization rates to 2-hydroxyethyl methacrylate (prevalence ratio [PR], 0.26; 95% CI, 0.15-0.47), carba mix (PR, 0.18; 95% CI, 0.06-0.55), thiuram mix (PR, 0.19; 95% CI, 0.06-0.61), and benzisothiazolinone (PR, 0.37; 95% CI, 0.17-0.84).

One allergen broke the pattern in the opposite direction: sensitization to hydroxyisohexyl 3-cyclohexene carboxaldehyde (Lyral) was significantly more frequent in dyshidrotic eczema (PR, 3.61; 95% CI, 1.34-9.72), a finding the authors said should be interpreted cautiously since it was not consistent across related fragrance allergens.

Occupational factors were implicated far less often in dyshidrotic eczema, cited in just 9% of cases vs 29% of other hand eczema cases. Perhaps most notably, no specific aetiology could be identified in 61.4% of dyshidrotic eczema cases after full diagnostic evaluation, a markedly higher proportion than the 15% reported by other researchers and up to 30% in other observational series, which the authors said may reflect both a genuine endogenous component and limits in current diagnostic approaches.

“The pattern of findings suggests that the dyshidrotic phenotype may follow a clinical course less dependent on external or occupational triggers,” the authors wrote, pointing toward “a relatively greater contribution of endogenous factors” compared with other hand eczema subtypes.

Retrospective Registry Data

As a retrospective analysis of registry data, the study is subject to the documentation practices and referral patterns of the participating centers, which may not capture the full spectrum of dyshidrotic eczema presenting in primary care or community dermatology settings. The registry's focus on patients referred for patch testing may also have enriched the sample for allergic contact dermatitis relative to the broader dyshidrotic eczema population, potentially understating how often the condition occurs without any identifiable contact allergen.

For dermatologists, the findings support tailoring the diagnostic workup to the clinical phenotype: a patient presenting with the classic vesicular, palmoplantar pattern of dyshidrotic eczema may warrant a closer look due to potential for endogenous or atopic contributors even when a standard patch test returns negative, rather than an automatic occupational exposure history.

References

1. Sánchez-Gilo A, Gómez de la Fuente E, Giménez-Arnau AM, et al. Epidemiological, clinical and allergic profile of patients with dyshidrotic eczema (acute and recurrent vesicular dermatitis): evaluation of the Spanish Registry of Research in Contact Dermatitis and Cutaneous Allergy (REIDAC). Contact Dermatitis. 2026;95(3):286-294. doi:10.1111/cod.70184
2. Ludmann P. Eczema types: dyshidrotic eczema overview. American Academy of Dermatology. Updated November 11, 2020. Accessed October 1, 2026. https://www.aad.org/public/diseases/eczema/types/dyshidrotic-eczema