Linear IgA Bullous Dermatosis - Symptoms, Causes & Treatment
Medically reviewed by Dr. Anand S. Urhekar, MD, MD Pathology, Clinical Advisor · Last updated July 2026
An autoimmune blistering disease in which IgA antibodies deposit in a line along the basement membrane of the skin, causing tense, itchy blisters that often form rings or clusters — the classic 'string of pearls' or 'cluster of jewels' appearance. It can be idiopathic or triggered by medication, most notably vancomycin.
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Quick Answer
Linear IgA bullous dermatosis is an autoimmune blistering condition producing tense itchy blisters, often arranged in rings — the 'string of pearls' sign. In adults it is frequently triggered by a medication, especially vancomycin. Diagnosis requires skin biopsy with direct immunofluorescence showing linear IgA. Treatment is stopping the causative drug plus dapsone, with corticosteroids for severe disease.
Symptoms
- Tense, fluid-filled blisters on red or normal skin
- Ring or rosette arrangement around a healing centre
- Itching, sometimes intense
- Trunk, buttocks, thighs and face; mouth involvement possible
- In children, the perineum and lower abdomen are typical
Causes & Risk Factors
- Autoimmune IgA antibodies against basement membrane proteins
- Drug-induced: vancomycin most commonly, also NSAIDs, captopril, phenytoin
- Occasionally associated with inflammatory bowel disease or lymphoma
- Idiopathic in many cases
Treatment & Management
- Stopping the suspected causative drug
- Oral dapsone (after checking G6PD status)
- Systemic corticosteroids for severe disease
- Sulfapyridine, colchicine or mycophenolate as alternatives
- Wound care and monitoring for secondary infection
When to See a Doctor
See a doctor promptly for any new blistering rash, and urgently if blisters involve the mouth or eyes, cover large areas, or come with fever — a biopsy is required for diagnosis.
Frequently Asked Questions
Does it go away?
Drug-induced cases usually resolve within weeks of stopping the trigger. Idiopathic disease often remits within a few years, particularly in children, but may need long-term dapsone in the meantime.
Is it the same as bullous pemphigoid?
No. Both are autoimmune blistering diseases but involve different antibodies. Direct immunofluorescence distinguishes them — linear IgA rather than IgG and C3 — and this changes the treatment choice.
Medical References
Information on this page is sourced from and verified against reputable medical resources:
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Medical Disclaimer: This information is for educational purposes only and is not intended as medical advice. The content on this page should not be used to diagnose or treat any health problem. Always consult with a qualified healthcare professional for proper medical evaluation, diagnosis, and treatment of your condition.