Aeschines, you say it’s self-diagnosed, so why not go see a dermatologist and get a formal diagnosis?
I mention this because I’ve had some pretty awful skin conditions and they all turned out to be contact dermatitis–and the conditions didn’t look alike.
I have twice ended up at hospital dermatology emergency clinics (yes, I was surprised they exist). Also, I ended up in a traditional emergency room (allergic reaction to sulfa drugs). This doesn’t include the usual visits just to see a dermatologist. None of the outbreaks resembled anything I’d ever had before, even though I’ve had contact dermatitis repeatedly
Jumping right to rosacea may be borrowing trouble. Get checked out by a board certified dermatologist and be sure. You may find you’re allergic to something simple.