Foundation should only be used for the sole purpose of evening out your skin tone and complexion.
No matter how bad or uneven your skin may be due to acne or sensitivity, never use a heavy coverage foundation to cover all your imperfections. That’s what concealer is for. The heavier your foundation, the worse you’ll look anyway. And the more harm you’re doing to your skin. Give your skin room to breath!
The less foundation you use, the more natural and better your overall complexion will look. If needed, use a heavy concealer, do not cake on your foundation.