Types of pemphigus
There are several types of pemphigus, based on where the blisters form and which layer of skin they affect.
Pemphigus vulgaris is the most common type in the U.S. It usually begins with fluid-filled blisters and painful sores in the mouth. Blisters may then appear on the skin.
Pemphigus foliaceus affects only the top layer of the skin (subcorneal). It causes painful or itchy blisters on the head, trunk, and extremities. Sores rarely appear inside the mouth or other moist areas.
IgA pemphigus is uncommon. It causes painful, itchy blisters that often appear on the torso and nearby limbs. Red patches or ring-shaped patterns may also develop.
This rare form is usually linked to an underlying tumor or cancer like lymphoma. Paraneoplastic pemphigus causes blisters on the skin, in mucous membranes, and in some internal organs, like the lungs (bronchiolitis obliterans).
Certain medications, like thiol-containing drugs, can trigger this form of pemphigus. Blisters may appear weeks or months after starting the drug. Drug-induced pemphigus is often less severe and may have a better outcome than other forms.