What is your approach to assessing whether oral/nasal ulcerations are features of systemic lupus erythematosus versus from another etiology?

Mucosal ulcerations due to lupus erythematosus (LE) are more complicated than many of us think. So, this question and answer are not as straightforward as many think.

First, the subtitle to this question is misleading. I would not use the word "blister," a lay term that I usually reserve for vesicle...