Bullous pemphigoid
Bullous pemphigoid is a rare autoimmune skin condition in which the immune system attacks the junction between the upper and lower layers of the skin.
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Medicines commonly prescribed for Bullous pemphigoid
For informational purposes only. Always consult a doctor before using any medicine.
Dosage form: CAPSULE, 100 mgActive substance: doxycyclineManufacturer: Laboratorios Llorens S.L.Prescription requiredDosage form: CAPSULE, 200 mgActive substance: doxycyclineManufacturer: Industrial Farmaceutica Cantabria S.A.Prescription requiredDosage form: CAPSULE, 100 mgActive substance: doxycyclineManufacturer: Industrial Farmaceutica Cantabria S.A.Prescription required
Bullous pemphigoid is a rare autoimmune skin condition in which the immune system attacks the junction between the upper and lower layers of the skin. The layers separate and large, tense blisters filled with clear fluid form. It mainly affects people over 70. It is not contagious, runs in waves and in most cases eventually burns itself out — but it does need treatment.
Symptoms
The condition often begins long before any blisters appear, with intense itching alone, which is why it is initially mistaken for eczema or an allergy.
- marked itching, sometimes for weeks or months before any rash;
- itchy raised patches and weals resembling insect bites;
- large tense blisters with clear or slightly blood-stained fluid, firm to the touch, which do not rupture with light contact;
- typical sites are flexural: behind the knees, in the armpits, on the inner elbows, as well as the abdomen, thighs and forearms;
- some people develop blisters and erosions in the mouth, making eating painful and swallowing difficult;
- scarring is unusual after healing, though the skin may darken.
When to see a doctor
- itching has persisted for several weeks with no clear cause — worth attending even without blisters;
- large or painful blisters have appeared;
- blisters keep recurring;
- there are blisters and erosions in the mouth and swallowing is difficult;
- the surrounding skin is hot, painful and swollen — signs of added infection;
- a blister is filled with pus or blood;
- a large area of skin is involved.
How it is diagnosed
Appearance alone is not enough for a reliable diagnosis: a biopsy is needed. Two skin samples are taken — one for routine examination and one for immunofluorescence, which shows the antibodies at the junction between the skin layers. A blood test for antibodies is also done. This matters: similar blisters occur in another condition, pemphigus vulgaris, which follows a far more severe course and is treated differently.
The doctor will also ask about all your medicines: some drugs can trigger pemphigoid.
Causes
The immune system produces antibodies against the proteins that bind the skin layers together. Why this happens is not precisely known. Recognised factors include:
- age — the main risk factor;
- medicines — some diabetes drugs in the gliptin class, diuretics, antibiotics and blood pressure medicines;
- neurological conditions — stroke, dementia, Parkinson's disease, multiple sclerosis;
- skin trauma, radiotherapy, sometimes sunburn;
- rarely, other autoimmune conditions.
Treatment
The aim is to stop new blisters forming, relieve the itch and let the skin heal. The regimen depends on how widespread the disease is:
- potent topical corticosteroids — for limited disease these are the main treatment and work well, with fewer side effects than tablets;
- oral corticosteroids for widespread disease, with a gradual reduction to the lowest effective dose;
- tetracycline antibiotics — prescribed not against infection but for their anti-inflammatory effect, often together with nicotinamide;
- immunosuppressants to allow the steroid dose to be reduced;
- biologic therapy for stubborn disease;
- antihistamines for itch;
- skin care — emollients and dressings over erosions.
With long-term steroids, blood pressure, glucose and bone density are always monitored, and bone- and stomach-protecting medicines are usually added. Treatment must never be stopped abruptly.
What you can do
- do not burst blisters: the intact roof protects against infection. If one is very large and painful, a healthcare professional should deal with it;
- wash the skin with warm water without soap and use emollients;
- wear loose cotton clothing and avoid friction;
- keep nails short so you do not scratch;
- if there are erosions in the mouth: soft food, nothing spicy or acidic, a soft toothbrush;
- use sun protection if you have noticed a link with sunlight;
- bring your doctor a complete list of your medicines, including those prescribed by other specialists.
Outlook
The condition runs in waves, with flares alternating with quiet periods. In many people a stable remission is reached after a few years and treatment can be withdrawn. The main risks come not from the blisters themselves but from infection of the erosions and from the side effects of prolonged steroid treatment — which is why the dose is always kept as low as possible.
Common questions
Is it contagious? No. It is an autoimmune condition and is not passed on by contact.
Will it leave scars? Usually not. Dark or pale patches may remain and gradually even out.
Is it the same as pemphigus? No. Pemphigus affects a different level of the skin, runs a more severe course, and its blisters are flaccid and rupture easily. A biopsy distinguishes them.
Can it be cured completely? Many people achieve prolonged remission and stop treatment. Relapses are possible.
Online consultation
In an online consultation the doctor reviews photographs of the rash, considers prolonged itching that has not yet produced blisters, checks the link with your medication, explains why a biopsy is needed and which two samples are taken, and advises on skin care until you are seen by a dermatologist.
This material is for information only and does not replace a medical consultation.
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Reviewed on Jul 5, 2026
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