Dyshidrotic eczema
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"dyshidrotic eczema" OR "pompholyx"
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Dyshidrotic Eczema (Pompholyx)
Panel A: Deep-seated vesicles along lateral finger aspects (blue arrows). Panel B: Severe palmar presentation with confluent bullae and crusting (green arrow).
Definition & Overview
Dyshidrotic eczema is a chronic, relapsing palmoplantar eczematous dermatosis characterized by firm, pruritic vesicles and bullae. The vesicles arise from spongiosis within the epidermis; their intact nature reflects the thick, tear-proof stratum corneum at acral sites. It is not an independent disease entity — it is most often a manifestation of atopic dermatitis, or irritant/allergic contact dermatitis.
- Synonyms: Pompholyx (larger vesicles/bullae), acute and recurrent vesicular hand dermatitis
- Epidemiology: Affects all ages; women twice as often as men
Pathogenesis
Despite the misleading name ("dyshidrotic" = disordered sweat), vesicle formation is not linked to sweat gland dysfunction or sweat trapping. Key triggers and associations include:
| Factor | Notes |
|---|---|
| Atopic dermatitis | Most common underlying association; late-stage manifestation |
| Allergic/irritant contact dermatitis | Can cause acute or subacute flares |
| Hyperhidrosis | Aggravating factor; botulinum toxin A for hyperhidrosis may ameliorate DE |
| Ingestants (nickel, cobalt) | Low-nickel diet may help nickel-sensitive patients (positive oral provocation test) |
| IVIg | Can trigger acute episodes |
| Emotional stress | A recognized precipitant |
| Hot climates / sunlight | Rare triggers |
Clinical Features
- Distribution: Symmetric, deep-seated vesicles of the palms, lateral and medial finger aspects, and less commonly soles and toes
- Morphology: Firm, pruritic vesicles initially containing clear fluid; range from pinhead-sized to several centimeters (the larger "pompholyx")
- Tapioca sign: Clustered small vesicles resemble tapioca pudding — a classic descriptor
- Evolution: Vesicles rupture → purulent superinfection may occur → resolves via thick, characteristic desquamation
- Prodrome: Itching or burning of hands/feet before vesicles appear
- Minimal variant: Dyshidrosis lamellosa sicca (keratolysis exfoliativa) — no blisters, only small annular collarettes of white scale
Histopathology
Spongiotic dermatitis with micro- and macrovesicle formation within the epidermis. No association with sweat glands is seen. The thick stratum corneum is a clue to the acral location.
Differential Diagnosis
| Condition | Distinguishing Feature |
|---|---|
| Inflammatory tinea manuum/pedis | KOH prep positive; asymmetric |
| Scabies | Burrows; interdigital spaces; systemic itch |
| Palmoplantar pustular psoriasis | Sterile pustules; associated nail/skin psoriasis |
| Dyshidrosiform pemphigoid | Elderly; serology (anti-BP180/BP230) positive |
| Dyshidrotic cutaneous T-cell lymphoma | Skin biopsy with atypical lymphocytes |
| Erythema multiforme | Target lesions; mucosal involvement |
| Fixed drug eruption | Recurs at same site; drug history |
| Id reaction | Related to distant infection/dermatophytosis |
| Infantile acropustulosis | Children; recurrent pruritic acral pustules |
Treatment
First-line (mild–moderate):
- High-potency topical corticosteroids — mainstay; apply twice daily during flares
- Cold compresses — symptomatic relief of burning/itch
- Greasy emollients — moisturize, protect barrier, prevent fissures
- Cyanoacrylate ("superglue") — seals painful skin fissures
Second-line (refractory/chronic):
- Topical calcineurin inhibitors (tacrolimus, pimecrolimus)
- Topical retinoids
- Phototherapy: Bath PUVA > systemic PUVA; NB-UVB; note that bath PUVA may be less effective in smokers
- Short-course oral corticosteroids — for acute severe flares
- Systemic immunosuppressants: Cyclosporine, oral retinoids for chronic recalcitrant cases
- Botulinum toxin A: Addresses co-existing hyperhidrosis and may reduce flare frequency
Address underlying causes: Patch testing to exclude allergic contact dermatitis; nickel-restricted diet in sensitized patients.
Recent Evidence
Two 2025 systematic reviews are relevant:
- Dupilumab in chronic hand eczema (Asamoah et al., Arch Dermatol Res 2025) — PMID 39976781 — supports dupilumab as an emerging systemic option
- Pediatric chronic hand eczema patterns (Yeung et al., J Cutan Med Surg 2025) — PMID 40008983 — reviews causes and management in children
Sources: Dermatology 2-Volume Set 5e (Bologna et al.); Textbook of Family Medicine 9e; Fitzpatrick's Dermatology, 9e
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