Concealer is the one staple in a woman's beauty regimen that can dramatically change your appearance. Used correctly, concealers can brighten a tired face, cover up blemishes, and can conceal under-eye circles.
Before you apply any concealer, wash your face with a mild face cleanser and apply a moisturizer. Use makeup remover to get rid of any darkness under your eyes that might be the result of old mascara. Your concealer is the first step in your makeup application, and will go on most smoothly over a blank canvas.