Acne is the common cause of spots. Most people with acne are aged between 12 and 25 years, but some older and younger people are affected too. Small sebaceous glands lie just under your skin surface and make an oil (sebum) that keeps your skin supple and smooth. Tiny pores on your skin allow the sebum to come on to the surface of your skin. In acne, some of these pores become blocked, causing small pimples, blackheads and whiteheads. Azelaic acid skin cream and gel mainly work by unplugging blocked pores
This is a companion discussion topic for the original article at https://patient.info/medicine/azelaic-acid-finacea-skinoren