Question of the Day

Pemphigus foliaceus, pemphigus vulgaris, and bullous pemphigoid are generally considered type II reactions.

Antibody binds antigen on a cell, then the antibody-antigen complex activates complement, causing cell lysis. 
In general, think of rare, autoimmune skin diseases characterized by varying presentations of ulceration, crusting, pustules, vesicles.

Click here to see images of: 
Moderate pemphigus foliaceus 
Severe pemphigus foliaceus 
Bullous pemphigoid

FYI: “Delayed hypersensitivity” is the same as a type IV reaction.

Image courtesy of Caroldermoid.