U should see a derm for sure.
I have mild acne vulgaris , tried everything under the sun but the only results were super oily skin, flaking and redness from everything prescribed.
I tried accutane at 20mg a day for a year and a half and it worked wonders, I also know of a guy with cystic acne that also used it and his skin is near flawless now.
It does have side effects tho, but in my case it was a miracle