Epidermolysis Bullosa Acquisita
A rare autoimmune blistering disease of the skin
Quick Facts
- Type: Rare autoimmune blistering skin disease
- Cause: Antibodies against type VII collagen in the skin
- Hallmark: Fragile, blistering skin at friction-prone areas
- Inheritance: Acquired (autoimmune), not inherited
Overview
Epidermolysis bullosa acquisita (EBA) is a rare autoimmune disease in which the immune system mistakenly attacks a protein called type VII collagen. This protein acts like an anchor that holds the outer layer of skin (the epidermis) to the deeper layer (the dermis). When the anchor is damaged, the skin layers separate easily, leading to blisters and fragile skin.
Despite its name, EBA is different from the inherited forms of epidermolysis bullosa, which are present from birth and caused by gene changes. EBA is acquired, usually develops in adulthood, and results from an immune problem rather than an inherited gene fault.
EBA is a long-term condition that tends to come and go, with periods of more active blistering followed by quieter spells. Because it is rare and can resemble several other blistering diseases, it is often diagnosed by a dermatologist after specialized testing. With ongoing care, many people are able to control their symptoms and protect their skin, although treatment frequently needs to be adjusted over time to find what works best.
Symptoms
Symptoms vary, but common features include:
- Blisters and skin fragility, especially over areas that rub or take knocks, such as the hands, elbows, knees, and feet
- Skin that tears or blisters after minor trauma
- Healing that leaves scars and small white bumps called milia
- Blisters or sores in the mouth, eyes, or other moist linings in some people
- Nail changes or hair loss over scarred areas
Some people have a more inflamed, widespread form with red, itchy blisters that resemble other blistering diseases.
Causes
EBA is caused by the immune system producing antibodies that target type VII collagen. Normally, antibodies fight infections, but in EBA they attack the body's own anchoring protein, weakening the bond between skin layers.
The reason the immune system does this is not fully understood. EBA sometimes occurs alongside other autoimmune or inflammatory conditions, such as inflammatory bowel disease or lupus. It is not contagious and is not caused by an infection, poor hygiene, or anything a person did.
Risk Factors
- Having another autoimmune condition, such as inflammatory bowel disease or lupus
- Adulthood, as EBA most often begins in middle age, though it can affect any age
EBA is rare and does not have lifestyle causes. It is not inherited, so it does not run in families the way the genetic forms of epidermolysis bullosa do.
Diagnosis
Because EBA can look like other blistering diseases, specialized tests are needed:
- Skin biopsy: A small skin sample is examined under a microscope to see where the skin layers separate.
- Immunofluorescence testing: Special staining of skin and blood detects the antibodies and shows their location at the anchoring layer.
- Blood tests: These can identify antibodies against type VII collagen and help distinguish EBA from similar conditions.
A dermatologist usually coordinates these tests to confirm the diagnosis.
Treatment
EBA can be challenging to treat, and care is tailored to severity. Goals are to calm the immune attack, protect the skin, and prevent complications.
- Immune-modifying medicines: Corticosteroids and other drugs that dampen the immune system can reduce blistering. Certain antibiotics and other agents are used for their immune effects.
- Wound care: Gentle skin handling, protective dressings, and careful cleaning help blisters heal and prevent infection.
- Eye and mouth care: Specialists may be involved if these areas are affected to prevent scarring and complications.
- Treating infections: Open skin can become infected, so prompt treatment is important.
Treatment is long-term, and finding the right combination often takes patience and close follow-up.
Prevention
EBA cannot be prevented, but flare-ups and complications can be reduced by:
- Protecting the skin from rubbing and injury, including wearing padding over vulnerable areas
- Handling the skin gently and following a wound-care routine
- Keeping appointments and taking medicines as prescribed
- Reporting signs of infection, such as spreading redness, warmth, or pus, early
When to See a Doctor
See a doctor for unexplained, recurring blisters or skin that tears or blisters after minor trauma. Seek prompt care if you notice:
- Signs of skin infection such as spreading redness, warmth, pus, or fever
- Blisters or sores in the eyes or mouth that affect vision, eating, or swallowing
- Widespread or rapidly worsening blistering
Early evaluation by a dermatologist helps confirm the diagnosis and start effective treatment.
Frequently Asked Questions
Is epidermolysis bullosa acquisita the same as inherited epidermolysis bullosa?
No. EBA is an acquired autoimmune disease that usually begins in adulthood, while inherited epidermolysis bullosa is caused by gene changes and is present from birth. They share a name because both cause fragile, blistering skin, but their causes are different.
Is EBA contagious?
No. EBA is not contagious. It is caused by the immune system attacking a protein in the skin, not by an infection, and it cannot be passed to other people.
Can EBA be cured?
There is no cure, but treatment can control symptoms and reduce blistering. Care usually involves immune-modifying medicines, careful wound care, and protecting the skin, with long-term follow-up by a dermatologist.
What other conditions are linked to EBA?
EBA sometimes occurs alongside other autoimmune or inflammatory conditions, such as inflammatory bowel disease or lupus. Doctors may check for these when EBA is diagnosed.
How is EBA diagnosed?
Diagnosis requires a skin biopsy and specialized immunofluorescence and blood tests that detect antibodies against type VII collagen. These tests help distinguish EBA from similar blistering diseases.
References
- MedlinePlus, U.S. National Library of Medicine. Epidermolysis bullosa acquisita.
- Genetic and Rare Diseases Information Center (GARD). Epidermolysis bullosa acquisita.
- National Organization for Rare Disorders (NORD). Epidermolysis Bullosa Acquisita.
- DermNet. Epidermolysis bullosa acquisita.