Linear IgA Disease (LAD)

What is Linear IgA Disease?

Linear IgA disease (LAD), also called linear IgA bullous dermatosis, is a rare autoimmune blistering disease of the skin and sometimes the mucous membranes. IgA antibodies are deposited in a line along the basement membrane, the layer that joins the outer skin to the tissue beneath.^[1] It can occur in adults and in children, where it is known as chronic bullous disease of childhood.^[2]

Common symptoms

The main sign is blisters, often in clusters or rings, along with red raised patches that can resemble hives. Itching is common and can be severe.^[3] A review of 1,627 reported cases found vesicles (small blisters) and bullae (larger blisters) on the legs, abdomen and back, among other sites.^[4] The blisters can also affect the mouth, the eyes and the genital area.^{[1, 3]}

Causes and risk factors

The underlying cause is not fully known. Genetic factors appear to play a part, and certain immune (HLA) types are linked to the disease.^[2] In adults a drug cause must be considered, and vancomycin is the most commonly reported culprit, although most cases are not drug-induced.^{[2, 4]} Infections and other autoimmune diseases have also been reported alongside LAD, but this is better established for some associations than others.^[1]

How it is diagnosed and treated conventionally

Diagnosis is made by a dermatologist, who examines the skin and takes a biopsy for direct immunofluorescence, which shows the linear IgA deposits.^{[1, 3]} LAD can look like dermatitis herpetiformis, so the distinction matters.^[3]

Dapsone is typically the first-choice treatment, and alternatives depend on severity, access and earlier response.^[4] Because there are few large, well-designed trials, current guidelines rest largely on expert opinion.^[1] Management options are described as mostly anecdotal because randomized trials of LAD treatment are lacking.^[5]

Why Linear IgA Disease calls for a whole-person approach

LAD is driven by an immune reaction in the skin, but the person living with it also deals with itch, pain, disturbed sleep, treatment side effects and worry. Supportive care can reasonably focus on these.

Our role is supportive. We do not diagnose LAD, review biopsies or adjust medicines, and we ask that the diagnosis and treatment are in the hands of a physician first.

Itch and skin discomfort

Itch is common and can be severe in LAD.^[3] Whether treatments for itch in other conditions apply to this disease is unknown.

Medication triggers and side effects

Drugs, especially vancomycin, can trigger LAD, and your physician may need to review your medicines.^{[2, 4]} Dapsone and other immune-suppressing treatments have their own side effects and need monitoring by the prescriber, which is another reason we do not change or add to medicines.

Mood and stress

In a systematic review of bullous skin diseases, mostly bullous pemphigoid and pemphigus, depressive symptoms were reported in 40% to 80% of patients. LAD itself was not studied, but the finding suggests mood deserves attention in any blistering skin disease.^[6]

Acupuncture as supportive care in Linear IgA Disease

What the research shows

No clinical trials of acupuncture for linear IgA disease were found in PubMed. We therefore cannot say that acupuncture affects the blisters or the autoimmune process. What can be said comes from research on symptoms in other conditions.

For itch, a meta-analysis of 8 trials with 463 participants in atopic dermatitis found lower itch scores with acupuncture, but the authors cited limited quantity and quality of studies.^[7] A meta-analysis of 7 trials in 504 dialysis patients with uremic itch found acupuncture was more effective than conventional treatment.^[8] These are different diseases with different causes of itch, so the results may not apply to LAD.

For chronic pain in general, a large individual patient data meta-analysis found acupuncture better than sham or no acupuncture for musculoskeletal pain, osteoarthritis, headache and shoulder pain.^[9] This was not studied in people with blistering skin disease.

How acupuncture may work

No research explains how acupuncture might act in LAD. Any benefit for itch or pain would be a proposed effect on nerve signaling and not an effect on the antibody deposition that causes the disease.

What treatment involves

Acupuncture uses fine, sterile, single-use needles placed at selected points, usually left in place for about 20 to 40 minutes. A course usually involves several visits, and we reassess progress with you along the way. Needles are placed away from active blisters and open skin.

Minor reactions such as brief soreness, bleeding or redness at a needle site occur in about 9 in 100 patients, and serious events about 1 in 10,000.^[10] Tell your practitioner first if you have a bleeding disorder, take blood thinners, are pregnant, or have a pacemaker (relevant to electroacupuncture). Tell us also about any immune-suppressing medicine, and about any blistering or open skin so that the practitioner can choose sites carefully.

Ayurvedic medicine as supportive care in Linear IgA Disease

The Ayurvedic view

Ayurveda has no classical name for linear IgA disease. Blistering, itchy and inflamed skin conditions are traditionally grouped with disorders of the skin (Kushta) and described as involving aggravated Pitta, sometimes with Kapha, in the blood and skin. These are traditional frameworks for selecting supportive care, not biomedical diagnoses.

Therapies that may be used

Traditional supportive care is individualized and may include:

• Dietary and daily-routine advice, often with emphasis on cooling, simple foods and regular sleep
• Stress-reducing and breath-based practices
• Gentle, bland oils or emollients on intact skin, as agreed with your dermatologist
• Herbs chosen individually by a qualified practitioner after review of your medicines

Panchakarma, the traditional cleansing series, is not appropriate for LAD. It is also not appropriate in pregnancy, acute illness or frailty, or for people with widespread blistering or on immune-suppressing medicines, and we would not use it for this condition.

What the research shows

There are no clinical studies of Ayurvedic medicine for linear IgA disease. A PubMed search found no trials, case series or reviews. Any traditional approach should therefore be seen as supportive comfort care, not as a treatment for the disease, since guideline treatment of LAD rests on dapsone and other medicines.^{[1, 4]}

Ayurvedic products also carry quality and safety questions: about one fifth of those bought online contained detectable lead, mercury or arsenic, and ashwagandha has been linked to liver injury in a small case series.^{[11, 12]}

Herbal medicine as supportive care in Linear IgA Disease

Herbs and formulas that have been studied

No herbs or formulas have been studied for linear IgA disease. The closest evidence is for a related disease, bullous pemphigoid. A Cochrane review included one trial in which traditional Chinese medicine added to prednisone was not effective.^[13]

What the research shows

There is no clinical evidence that herbal medicine helps LAD. Because the disease has a recognized drug trigger, adding unfamiliar products is a concern in itself.^[2] Herbal medicine for this condition is limited to carefully chosen supportive measures, and we make no claim that it affects the blistering.

Safety and herb-drug interactions

Herbs are active substances and can interact with medicines. Case reports describe interactions with blood thinners, antidepressants and immunosuppressants.^[14] People who take dapsone, steroids or other immune-suppressing drugs need a review of any herb or supplement before use.

Herbal and dietary supplements are a recognized cause of liver injury, including ashwagandha, an Ayurvedic herb reported to cause liver injury in a small case series.^{[12, 15]} About one fifth of Ayurvedic products bought online contained detectable lead, mercury or arsenic.^[11] Herbs should come from tested sources and be prescribed individually. Tell us if you are pregnant or breastfeeding, or have liver or kidney disease.

Translating traditional medicine into modern biological language

This section is interpretation, not equivalence. Chinese medicine would describe blistering, itchy skin as damp-heat or heat in the blood, and Ayurveda would describe aggravated Pitta in the skin. Modern medicine describes an autoimmune reaction in which IgA antibodies deposit along the basement membrane.^[1]

No study has shown that a traditional pattern corresponds to a specific immune process, and no study has tested whether treating such a pattern changes this disease.

How this care fits with your medical care

This care is complementary and supportive. Keep your dermatologist and other physicians, and do not stop or change dapsone, steroids or any other prescribed medicine without your prescriber. For a condition like this, we ask that you are under a physician's care for it and that your treating team knows you are receiving complementary care.

Please bring your diagnosis and biopsy report, a full list of medicines and supplements, including any antibiotics taken recently, and notes from your dermatologist. Because LAD in children has its own pediatric evaluation, a child with blisters needs a pediatric physician first.

When to seek urgent medical care

New or fast-spreading blisters need prompt medical assessment, because other blistering diseases can be serious and need a different diagnosis.^[1]

• Rapidly spreading blisters or large areas of skin peeling
• Fever, chills, or blisters that are pus-filled, very red or warm, which can signal infection
• Eye pain, redness, light sensitivity or changes in vision
• Difficulty swallowing, or mouth sores that prevent eating or drinking
• Pale or bluish skin, shortness of breath, or unusual fatigue while taking dapsone
• A new rash or blistering shortly after starting a new medicine

For any emergency, call 911 or go to the nearest emergency department.