Does ozone therapy help in treatment of pemphigus vulgaris?

Probably not: No one has reported it in the conventional medical literature. That means that i can't tell you if it helps or not.

Ozone: Ozone gas/oils topically in mouth may help healing. Ozone blood therapy may be part of the approach to help your immune system behave itself. To try to avoid drugs, you'd need an astute alt med doc / naturopathic doctor with great nutritional training and ozone training. Maybe someone like dr robert rowen.