You could make a case for all 3 of these drugs, Fin, SSRIs and Accutane already having some immunosuppressive properties. Im sure you could also find some conflicting studies as well. They say acne itself might be part of an overactive immune response.
Selective serotonin reuptake inhibitors as a novel class of immunosuppressants
https://www.sciencedirect.com/science/article/pii/S1567576914000848