Use your azelaic acid product once per day, either in the morning before your sunscreen or at night, before your moisturizer.

Use a generous amount of product to remove all dirt, sunscreen or makeup in one step. There is no need to double-cleanse. It is a good idea to always finish cleansing with a splash of clean water to remove any residue from the cleanser. Most people only need to cleanse their skin with a cleanser once per day, at night. It is the first step of a night skincare routine.