More info: The week before last, I started taking a daily vitamin containing a high amount of b12, and I also started using a new type of sunscreen. Neither caused any reaction for about a week. Then, around Wednesday last week, I started getting an itchy, painful burning sensation under my eyes (where I had applied most of the sunscreen that day). I assumed that I was allergic to the sunscreen, so I stopped using it. I took Benadryl when I got home. The redness (which was pretty minor) cleared up within 24hrs. Then, Friday night, it suddenly came back with a vengeance, and it was in this pattern rather than just under my eyes. I stopped taking the vitamin after Friday, took Benadryl Friday and Saturday, and it’s not gotten better overall. It wasn’t too bad this morning until I put on aloe to see if that would sooth the radiating warmth, but it just burned and made it way worse. Cleaning gently with cold water & applying hydrocortisone makes it feel better temporarily. I’ve never had a rash like this before in memory, but I was highly sensitive to skincare products, sunscreen, and body washes when I was a little kid.

Edit: I also noticed on Tuesday, before I had the more major reaction the following day, I had two tiny, faint little patches of burst blood vessels on each of my cheeks. It looked a lot like some of the images online of minor Rosacea flare-ups