Red, like rash, all over my face?

Amanda
So two days ago my boyfriend noticed I had gotten "pimples" on my face. These appeared out of nowhere, id say it took less than a day to appear. Now, two days has passed and my face is fully covered in these. They do not itch, they did hurt when i brush my hair and accidentally hit them.
 Could it be the sun? My first sunny day was saturday and i wore a new sunscreen. 
Also i've gotten rid of my acne about a year ago with birth control and three weeks ago i changed from the brand Vreya to Diza. Could that be the reason or should i concider seeing a doctor of somekind?
This picture is taken yesterday, its a bit worse now.