Here are two disease names that are maddeningly similar: pemphigus vulgaris and bullous pemphigoid. Both diseases have bullae (big blisters), and both are mediated by antibodies – but they are different diseases that you have to learn separately. Here’s a post I wrote on the main differences between these two disorders. There is actually some logic behind the naming of each disease, and once you learn that little trick, the rest of the disease features fall into place. We’ll talk about this tomorrow in class!