What is Pemphigus

Pemphigus is a rare group of autoimmune blistering diseases where the body’s immune system mistakenly attacks the connections between skin cells, leading to painful blisters on the skin and mucous membranes. Because the immune system targets proteins that act as "glue" between cells, the skin loses its integrity, resulting in fragile, easily ruptured blisters that require specialized medical management.

What exactly happens in the body during Pemphigus?

In a healthy body, skin cells are held together by proteins called desmogleins. In Pemphigus, the immune system produces autoantibodies that target these specific proteins. When these connections are disrupted—a process called acantholysis—the skin layers separate, allowing fluid to accumulate and form blisters. While Pemphigus primarily affects the skin, it frequently involves the mucous membranes, such as the inside of the mouth, throat, nose, eyes, and genitals, which can make eating, swallowing, and breathing difficult.

What are the different types of Pemphigus?

The condition is classified based on where the blisters form and which proteins are targeted. The two primary forms of Pemphigus include:

• Pemphigus Vulgaris: The most common form, typically starting with painful mouth sores, followed by skin blisters that rupture easily.


• Pemphigus Foliaceus: A shallower form of the disease that typically causes crusty, scaly sores on the chest, back, and shoulders; it rarely affects the mouth.

How common is Pemphigus and who is affected?

Pemphigus is considered a rare disease, with an estimated global incidence ranging from 0.5 to 3.2 cases per 100,000 people per year. It is not contagious and is not considered strictly hereditary, though certain genetic markers may increase susceptibility. While it can occur at any age, it is most frequently diagnosed in adults between the ages of 40 and 60. There is no significant gender bias, though some studies suggest a slight prevalence in women. Geographic distribution varies, with higher incidence rates observed in populations of Jewish, Mediterranean, and South Asian descent.

How is Pemphigus different from other skin conditions?

It is common to confuse Pemphigus with other blistering conditions like bullous pemphigoid. The key clinical differentiator is the level of the skin at which the blistering occurs. In Pemphigus, the split occurs within the epidermis (the top layer of skin), making the blisters very fragile and prone to painful erosions. In contrast, bullous pemphigoid involves a deeper split at the junction between the epidermis and the dermis, often resulting in larger, more tense, and less fragile blisters.

Next steps

• Consult a board-certified dermatologist or a specialist in autoimmune bullous diseases for an accurate diagnosis via biopsy and blood tests.


• Connect with the 199 members of the Pemphigus community on DiseaseMaps.org to share experiences and coping strategies.


• Work with your medical team to develop a treatment plan, which often includes corticosteroids, immunosuppressants, or biologic therapies.


• Prioritize oral hygiene and gentle skin care to prevent secondary infections in open blister sites.

Medical Disclaimer: This information is for educational purposes only and does not constitute medical advice, diagnosis, or treatment; always seek the advice of a physician or other qualified health provider with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Pemphigus.


• Orphanet: Rare disease database, Pemphigus group.


• International Pemphigus & Pemphigoid Foundation (IPPF).


• OMIM (Online Mendelian Inheritance in Man): Clinical features and molecular basis of Pemphigus.