Boss wants me to come to work with makeup on tomorrow

I work in the jewelery section in Walmart. We were closed yesterday for Christmas and I was with my family but my face had completely broken out. My boyfriend's sister had given me this face mask a day prior and I had an allergic reaction to it. It's doing better today but still noticeable and my manager asked what happened. I said I had an allergic reaction. She told me she wants me to come to work with makeup tomorrow to cover that up. I said make-up is bad for my skin while I'm going through a breakout. She said "And your face is bad for business." There is nothing in my rules or employee handbook that states that makeup is apart of our dress code so technically she can't make me wear make up. But she wants me to come in with makeup tomorrow and I know it will make things worse