The best concealer that I have used to cover of my pimples would be hard candy concealer. They cover my pimples very well and it doesn't feel very heavy on my face. The only downside would be is that their concealer hangs onto my dry patches which makes it very noticeable.
I love hard candy products. One of the items I use every day is Hard Candy Sheer envy mattifying primer. It mattifies and controls oil on your skin. Prevents oil build up and reduces shine while reducing the need for foundation touch-ups. This primer is lightweight and is for oily, sensitive and problem prone skin. I wear this underneath my foundation and I love the way it looks on my face. You can apply it with your fingertips or beauty blender, or any make-up tool you want.
I have used multiple hard candy products. Two of these products are the pressed setting powder and a lip topper. The setting powder made my face feel a bit caked and the lip topper made my lips feel crusty and really unvomfortable.