I find when I put on concealer after, it looks really blotchy, I don't have much to cover though, just a few scars I get from little pimples I get near 'time of the month'and some red blemishes here and there.. so I dab a little under and put on regular foundation.. Plus my conealer is a lighter color than regular foundation but my under eye, I do after since it's a brightenning one and it doesn't make much sense to put it under. So to answer your question.. face concealer under foundation, under eyes concealer over foundation..