Clean your shit
I’m sure you’ve heard this before but clean your brushes! Your brushes can hold so much bacteria in them which can cause acne. For a very long time I has cystic acne on my cheeks where I would contour and for the life of me I couldn’t figure out why. I thought it was the product I was using so I stopped using that one and switched up my face products. Yet I still didn’t clean my brushes. Once I did just that my acne started going away. Put a day aside once a week to clean your brushes.
You can buy brush cleaner in the makeup isles at any drug store, personally I use dawn dish soap and at least clean your face brushes. Including your beauty sponge. This will improve the health of your skin.
Another tip if you’re not doing this already wash your pillowcases once a week it will help your skin as well