In short. How pemphigus separates the skin, why it is treated as a serious disease, and the treatment classes used with the monitoring they demand.
Key points
- The goals are healing of existing lesions, prevention of new ones, and the lowest treatment exposure that maintains that state.
- Most people need treatment for a long time.
- Some reach a remission that allows it to stop; others need ongoing maintenance.
Pemphigus is a group of autoimmune diseases in which antibodies attack desmogleins, the proteins that hold neighbouring epidermal cells together. When those bonds fail, the cells separate from one another in a process called acantholysis, and fluid collects to form a blister. Because the split happens inside the epidermis, the blister roof is thin and fragile and ruptures easily, leaving raw eroded skin that heals slowly.
The main types
Pemphigus vulgaris is the commonest form and often begins with painful erosions in the mouth, sometimes weeks or months before any skin blistering appears. Pemphigus foliaceus causes crusted, scaly lesions on the skin with little or no mucosal involvement, and is frequently mistaken for eczema or impetigo. Drug-induced pemphigus, IgA pemphigus and paraneoplastic pemphigus are less common and each carries its own implications. The distinction matters because the types differ in severity, in the tests that confirm them, and in how aggressively they are treated.
Why it is taken seriously
For two reasons. Extensive eroded skin breaches the body's main barrier, so people with widespread disease lose fluid, protein and heat through it and are vulnerable to infection. And the mouth can be so involved that eating and drinking become difficult, with consequences for nutrition and hydration. Before effective immunosuppressive treatment existed, pemphigus was frequently fatal. It is far more treatable now, but it can still become dangerous quickly and needs specialist care.
How it is confirmed
Diagnosis rests on a biopsy showing separation within the epidermis, direct immunofluorescence showing antibody deposited between epidermal cells in a net-like pattern, and blood tests for circulating antibodies against desmoglein 1 and desmoglein 3. Antibody levels help to follow activity, although they do not always track the disease exactly.
Treatment classes
Treatment aims to suppress the antibody attack. Systemic corticosteroids are the mainstay for rapid control, used at the lowest effective exposure because long-term use brings weight gain, raised blood sugar and blood pressure, bone loss, cataract and infection risk. Steroid-sparing agents, including azathioprine, mycophenolate mofetil, methotrexate and dapsone, are added so that steroid exposure can be reduced. Rituximab, a biologic that targets B cells, is now used early in moderate to severe disease and has improved outcomes. Topical corticosteroids, local injections and meticulous wound care support the skin itself.
Monitoring
Every one of these treatments needs surveillance. Blood counts and liver and kidney function are checked before starting and at intervals afterwards. Some agents need specific testing before a first prescription. Infections must be looked for actively, because immunosuppression blunts the signs that would normally announce them. Vaccination status is reviewed before treatment begins. Follow-up continues after the skin has settled, because relapse during tapering or after stopping is common.
What control looks like
The goals are healing of existing lesions, prevention of new ones, and the lowest treatment exposure that maintains that state. Most people need treatment for a long time. Some reach a remission that allows it to stop; others need ongoing maintenance. Both are normal courses, and neither is a failure.
Seek care urgently if
- New blisters or erosions are appearing quickly, or a large area of skin has lost its surface.
- Mouth or throat involvement is making it hard to eat, drink or swallow.
- Fever, chills or spreading redness suggests infection on eroded skin.
Frequently asked questions
Why do pemphigus blisters break so easily?
Because the split forms inside the epidermis. Antibodies attack the proteins that hold neighbouring epidermal cells together, and when those bonds fail the cells separate in a process called acantholysis. The blister roof is therefore thin and fragile, ruptures easily, and leaves raw eroded skin that heals slowly.
Why does pemphigus sometimes start in the mouth?
Pemphigus vulgaris, the commonest form, often begins with painful erosions in the mouth, sometimes weeks or months before any skin blistering appears. Mouth involvement can become severe enough that eating and drinking are difficult, with consequences for nutrition and hydration.
Does treatment for pemphigus ever stop?
Sometimes, but not for everyone. Most people need treatment for a long time. The goals are healing existing lesions, preventing new ones, and using the lowest exposure that maintains that state. Some reach a remission that allows treatment to stop; others need ongoing maintenance. Follow-up continues after the skin settles, because relapse is common.
Risks & Limitations
- These are chronic conditions that are managed rather than cured, and flares are expected along the way.
- Immunosuppressive treatment raises the risk of infection and needs regular blood monitoring.
- Long-term systemic corticosteroids carry real side effects, including bone, metabolic and eye complications.
- Steroid-sparing agents and biologics have their own risks, including blood count, liver and kidney effects.
- Treatment is usually long term, and relapse is common when it is reduced or stopped.
- No treatment works for everyone, response cannot be predicted, and nothing here is guaranteed.
- Some scarring, pigment change and hair loss may be permanent even with good control.
When to Seek Care
- Widespread blistering, or raw eroded skin that is spreading — seek urgent care.
- Blistering or erosions in the mouth or throat that make eating or drinking difficult — seek urgent care.
- Fever with a rash, especially while on immunosuppressive treatment.
- Sudden severe skin pain or peeling of the skin — seek emergency care immediately.
- New breathlessness or chest pain, which may indicate involvement beyond the skin — seek emergency care.
References & Further Reading
- American Academy of Dermatology (AAD) — public and clinical guidance
- International Pemphigus & Pemphigoid Foundation — patient and clinical resources
- Cochrane Library — systematic reviews in dermatology
- Chinese Medical Association, Dermatology Branch — clinical guidance
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.