What causes acne?
An acne lesion (pimple) grows when bacteria, oils and dead skin fill up and inflame pores, the tiny openings in your skin through which oil and sweat rise to the surface. Some 40,000 cells fall off your skin every hour but, sometimes, those dead cells clog up a pore. Sometimes clogged pores are small and result in “whiteheads or blackheads.” Sometimes these pores become inflamed and lead to other types of acne.