Azelaic acid is a naturally occurring dicarboxylic acid found in grains like barley, wheat, and rye. It is known for its anti-inflammatory, antibacterial, and skin-brightening properties. Originally used to treat acne, azelaic acid has also gained popularity for its ability to inhibit melanin production, making it an effective hyperpigmentation treatment and melasma solution. Here are 5 beauty benefits of this skincare ingredient.