I am obsessed with BeneFit's Stay Don't Stray stay-put primer for concealers and eyeshadows ($24; benefitcosmetics.com). To be honest, when I first got it, I thought it was a concealer, so I slathered it on below and above my eyes (a mistake, as they say, a little goes a long way). But after I had wiped off the excess, what I was left with were bright, less lined looking eyes. That's when I stopped and took a look at the label (it said to be used as a primer before concealer or shadow) and the instructions (just use a pea-size amount). But here's the thing, although it does do a fantastic job as a lid primer, holding makeup in its place, my original instince wasn't so off the mark. It also makes a fantastic concealer, completely camouflaging dark circles...provided you use a dab only. It also contains sodium hyaluronate and vitamins C and E, so it's not just concealing, it's healing your skin. Love and adore!