What is the purpose of concealer?

A concealer is also a type of cosmetic which is used to conceal or hide or sort of dark spots, blemishes , scars, redness and darkness. After done with primer and foundation blend concealer to set the makeup. You can apply it with your fingers and you can also use brush.

Take a lighter shade of concealer than your foundation. It is not necessary to apply concealer on full face you can apply it by Dot where you have dark spot, blemishes etc