Neither the First Aid screenshot or the Bootcamp video mention Bullae in the context of EM, even if it is included in a new version of First Aid that I haven’t reviewed, that still doesn’t differentiate it from Stevens Johnson Syndrome, see the below citation for what is used to differentiate between the two and hence the recommended change.
https://academic.oup.com/milmed/article/185/9-10/e1847/5830797#:~:text=Both%20EM%20and%20SJS%20may%20present%20with%20erythematous%2C%20targetoid%20lesions.&text=The%20key%20difference%20with%20EM,are%20typically%20raised%20or%20papular.&text=EM%20lesions%20are%20round%2C%20erythematous,surrounded%20by%20areas%20of%20blanching.
“Both EM and SJS may present with erythematous, targetoid lesions. The key difference with EM is that the lesions are typically raised or papular. EM lesions are round, erythematous, edematous papules that are surrounded by areas of blanching.”
Atlas:
