3rd course of Accutane

I've went on two courses of accutane back in high school. I never had cystic acne, just extremely oily and bumpy skin that didn't respond to anything. My skin stayed very clear for about 6 years since my last course, and out of nowhere, it's starting to break out like crazy! (mainly my forehead). My dermatologist is putting me on a 3rd course. My question is, will this third course finally nip it in the butt? And also, could it potentially affect my health since it is my third time?

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