Ugh... It suddenly flipped out. What could be the problem?

It was fine until yesterday, but when I woke up, something bumpy popped up on my cheek... Ugh.

I haven't really changed my cosmetics, so I'm wondering if it's because the weather suddenly got dry, or if it's because I haven't been getting enough sleep lately?

I have a cooling modeling pack on right now. What would be best to soothe this? Should I go to the hospital and get an anti-inflammatory injection, or will it go down if I just leave it alone?

Has anyone else had similar symptoms to mine? ㅠㅠ Please share some tips in the comments... I have plans tomorrow, this is a big problem.