Concealer. Dermaceal Light Joe Blasco Makeup-Concealer A waterproof concealer. This special, high-pigmented cream formula is used to conceal discolorations, birthmarks, colored flat scars, freckles, and very dark under-eye shadows. Apply as follows: Scoop a small amount of Dermaceal from the container with a cosmetic spatula. Spread over discoloration with spatula then rub with fingers to blend. Pat to stabilize and powder lightly with Blasco No-Color.