Concealer makeup covers imperfections of the skin. Concealer is often used for any extra coverage needed to cover blemishes, undereye circles, and other imperfections. Concealer is often thicker and more solid than foundation, and provides longer lasting, more detailed coverage. Some formulations are meant only for the eye or only for the face. This product can also be used for contouring the face like ones nose, cheekbones, and jaw line.