Concealer should be labeled non-comedogenic or non-acnegenic - meaning it won't cause acne. It should provide full coverage with a matte finish (A matte finish hides imperfections.
2. Color Corrector can neutralize the color in acne. Buy a green color corrector to cancel out color in red acne scars. Use a rust colored corrector to neutralize dark grey or purple scars.
3. Primer smooths recessed acne scars and makes concealer last longer. Learn how to use these items to cover acne scars here: https://masterpieceskinrestoration.com/blog/acne-scar-treatment/