What is concealer?
Concealer — is a cosmetic product with a high concentration of pigments, designed for targeted concealment of localized skin imperfections, such as dark circles under the eyes, age spots, redness and fine wrinkles.

The main difference between this product and foundation is its thicker texture. This allows it to cover imperfections without the need to apply a thick layer of makeup all over the face.
The answer to the question of what concealer is also includes its brightening function. The product is often used to contour the face and create a visual lifting effect.
The term itself is derived from the English word conceal , which translates as "to hide" or "to conceal."
Main types
Liquid concealers are a versatile format with a lightweight texture. They're ideal for the eye area because they don't settle into fine lines and are easy to blend.

Creamy textures and sticks offer high coverage. They're designed to conceal visible imperfections, including acne, post-acne marks, and scars, and offer increased wearability.
Color correctors work on the principle of the color wheel. Green neutralizes redness, peach or salmon counteracts dark circles under the eyes, and lavender conceals unwanted yellowness.

Light-reflecting concealers contain tiny shimmering particles (illuminators). These products visually even out skin texture and give the face a fresh, rested appearance.
How to use
Classic beige concealers are applied over foundation. Color correctors, on the other hand, are used directly under foundation to neutralize the color beforehand.

A dotting technique is used around the eyes. A small amount of product is applied to the inner and outer corners of the eyes, then blended outward toward the temples for a lifting effect.
For localized blemishes, apply the product precisely to the blemish. The edges are carefully blended with a thin synthetic brush or your fingertips, as the warmth of your hands helps the product blend into the skin.
To prevent makeup from creasing in the folds of the eyelids, set it in place. Apply a thin layer of translucent powder over the concealer.