Azelaic acid is a naturally-occurring acid known for being able to fight acne and rosacea, though it's also said to help with hyperpigmentation and melasma.

Azelaic acid has also been shown to block tyrosinase (aka the enzyme that’s responsible for producing melanin or pigment in your skin), which makes it an effective fighter against hyperpigmentation.

Downie says that azelaic acid is also a tyrosinase inhibitor, meaning it can prevent hyperpigmentation because it interferes with melanin production. "It's anti-inflammatory for the acne and it's ...

2. It Fights Acne As mentioned before, azelaic acid’s most renowned trait on its beautifying resume is its ability to treat acne (it’s been FDA-approved for this, too, says Chi).

“Azelaic acid and tranexamic acid are wonderful brighteners for the skin,” says Trampetti. “They’re excellent, excellent, excellent for people who are prone to hyperpigmentation.