# Hailey-Hailey Disease

> Hailey-Hailey disease for NEET-PG Dermatology covers ATP2C1 mutation, flexural erosions, brick wall histology, negative immunofluorescence and trigger control.

- Canonical URL: https://prepelephant.com/topics/neet-pg/dermatology/hailey-hailey-disease
- Exam / course: NEET-PG · Subject: Dermatology
- Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team
- First published: 2026-10-08
- Last updated: 2026-10-08
- Reference basis: Rook's Textbook of Dermatology; Fitzpatrick's Dermatology; Andrews' Diseases of the Skin
- How to cite: "Hailey-Hailey Disease", PrepElephant, https://prepelephant.com/topics/neet-pg/dermatology/hailey-hailey-disease

## Direct answer

Hailey-Hailey disease is a rare autosomal dominant genodermatosis caused by ATP2C1 mutations, which impair the calcium pump that keeps keratinocytes adherent. It presents with recurrent, malodorous erosions and fissured plaques in flexures such as the neck, axillae and groin. Histology shows widespread suprabasal acantholysis with a dilapidated brick wall appearance, and direct immunofluorescence is typically negative.

## What you must remember

- **Gene:** ATP2C1 on chromosome 3q21, encoding the Golgi calcium and manganese pump SPCA1; loss of function disrupts desmosomal adhesion.
- **Distribution:** flexural areas such as the neck, axillae, groin, inframammary and perianal regions, with sparing of palms and soles.
- **Lesions:** erythematous plaques with vesicles, erosions and fissures that are macerated, malodorous and recurrent.
- **Triggers:** heat, sweating, friction, obesity and secondary infection, especially Candida and bacteria.
- **Histology:** suprabasal acantholysis throughout the epidermis with the dilapidated brick wall appearance.
- **Immunofluorescence:** negative for intercellular IgG, which helps distinguish it from pemphigus vulgaris.
- **Management:** avoid triggers, treat infection, use topical steroids or calcineurin inhibitors during flares, and consider botulinum toxin for associated hyperhidrosis.

## A diagnostic sequence for flexural erosions

Flexural erosions in a young adult with a family history should prompt consideration of Hailey-Hailey disease, but infection and pemphigus must be excluded. Follow these steps to reach a reliable diagnosis.

1. **Take the history:** ask about onset in adolescence or early adulthood, family history and flares linked to heat and sweating.
2. **Examine the distribution:** flexural sites with sparing of palms and soles favour the diagnosis.
3. **Exclude infection:** culture or potassium hydroxide preparation for Candida and bacteria, since superinfection worsens the picture.
4. **Biopsy an active edge:** a punch biopsy from an active margin, avoiding crusts, shows the acantholysis.
5. **Read the histology:** suprabasal acantholysis throughout the epidermis with a dilapidated brick wall suggests Hailey-Hailey disease rather than pemphigus.
6. **Plan treatment:** control triggers, treat infection and offer topical steroid or calcineurin inhibitor courses during flares.

Steps 2 and 5 do most of the work in separating this disease from its look-alikes, so they should not be skipped even when the rash looks typical.

## Where Hailey-Hailey and pemphigus get confused

The two conditions share acantholysis, so exam stems focus on age, site and immunofluorescence.

- **Trap:** diagnosing pemphigus vulgaris for flexural erosions in a young adult with a family history. **Correct:** Hailey-Hailey disease is familial and flexural with negative immunofluorescence, whereas pemphigus shows intercellular IgG.
- **Trap:** calling the disease Darier disease because both show acantholysis. **Correct:** Darier disease has greasy keratotic papules and nail notches, while Hailey-Hailey disease has macerated erosions without keratosis.
- **Trap:** ignoring Candida in a macerated flexural lesion. **Correct:** infection is a common trigger and must be treated alongside the underlying disease.
- **Trap:** using systemic steroids as first-line therapy. **Correct:** most patients need only trigger control and topical treatment.

## Frequently asked questions

### What does the dilapidated brick wall appearance show in Hailey-Hailey disease?

The dilapidated brick wall appearance shows widespread suprabasal acantholysis in which keratinocytes remain in a disorganised row, resembling a broken brick wall. It is the histological hallmark of Hailey-Hailey disease and helps distinguish it from pemphigus.

### Which gene is mutated in Hailey-Hailey disease?

Hailey-Hailey disease is caused by mutations in ATP2C1 on chromosome 3q21, which encodes SPCA1, a Golgi calcium and manganese pump. The defect disrupts calcium-dependent keratinocyte adhesion and produces acantholysis.

### Why is immunofluorescence useful in Hailey-Hailey disease?

Direct immunofluorescence is typically negative in Hailey-Hailey disease, whereas pemphigus vulgaris shows intercellular IgG deposition. A negative result therefore supports Hailey-Hailey disease when the clinical picture is compatible.

### Which triggers worsen Hailey-Hailey disease?

Heat, sweating, friction, obesity and secondary bacterial or Candida infection are the main triggers of Hailey-Hailey disease flares. Avoiding them, keeping the skin dry and treating infection form the basis of management.

### What role does botulinum toxin play in Hailey-Hailey disease?

Botulinum toxin reduces sweating in axillary hyperhidrosis that aggravates Hailey-Hailey disease, and it may help selected patients. It is an adjunct that controls one trigger and does not treat the underlying acantholysis.