When your immune system mistakes your skin for a foreign invader

Health · Published 20 October 2026 · Updated 20 October 2026 Swipe more like this →

In short: Pemphigus vulgaris is a rare autoimmune disorder where the body's defense system malfunctions, attacking healthy skin cells. This internal betrayal causes the skin to lose its cohesion, resulting in fragile blisters that burst easily. It is a condition where the body's own protection becomes its primary source of damage.

The mechanism of pemphigus vulgaris is a type II hypersensitivity reaction. In this process, the immune system produces autoantibodies that target desmosomes—the microscopic components that act like glue to keep skin layers bound together. Specifically, these antibodies attack desmoglein 1 and desmoglein 3. When these connections are broken, a process called acantholysis occurs, causing the skin layers to separate and form flaccid blisters. This disruption of the skin's barrier function can make the condition behave physiologically like a severe burn.

The disease typically strikes middle-aged or older adults, often beginning with painful blisters in the mouth and throat. Because these sores can make swallowing and speaking difficult, patients frequently face complications like weight loss and malnutrition. While the condition is not contagious and is not passed down through families, it can be life-threatening. Without treatment, mortality rates were historically close to 90%, though modern interventions like corticosteroids and rituximab have reduced that risk significantly.

Treatment is often multimodal and individualized. While steroid tablets and creams are standard, some patients may require other medicines like azathioprine or rituximab, particularly for refractory oral disease. Because the condition is chronic, patients may require steroids for several months and other medications for several years. Management also involves rigorous hygiene to prevent sepsis—a life-threatening infection of the bloodstream—and monitoring for long-term skin color changes, such as hyperpigmentation or hypopigmentation, which are more common in people with brown or Black skin.

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