Do you think a drug triggered the possible SJS?

That's how someone I know got SJS, her eyes got affected the worst from it.
This person started out with Pemphigus vulgaris. The treatment for PV caused the SJS.

sores in the mouth were her first symptoms.

[Pemphigus vulgaris is an autoimmune disorder that involves blistering and sores (erosions) of the skin and mucus membranes.]
http://www.nlm.nih.gov/medlineplus/e...cle/000882.htm