A concealer or color corrector is a type of cosmetic that is used to mask imperfections on the skin.
To use a concealer, an individual typically applies a small amount of product to the area of the skin that they want to cover.
The concealer is then blended into the surrounding skin using a brush, sponge, or the fingertips to create a seamless finish.
When picking a concealer, people tend to choose one or two shades lighter than their skin tone to better hide their blemishes and dark circles under the eye; once blended out and then set with a powder, it will be smooth and resemble more youthful skin.
Green and blue can counteract red patches on the skin, such as those caused by pimples, broken veins, or rosacea.