More product does not equal a better result when it comes to active ingredients like azelaic acid, so start with a small amount!
We recommend applying an azelaic acid serum the same way we would recommend any other serum. Start with a small amount (just half a pump!), applied evenly over the face using the #13dottechnique.
When you first start using your azelaic acid serum, apply it every other day, and gradually build up to a full pump of product, daily.