Add Yahoo as a preferred source to see more of our stories on Google. When our least-favorite, uninvited houseguest shows up—acne—we know it’s time to book a facial. There’s something about a ...

Your skin produces sebum, which can be waxy or oily. Sebum production can contribute to acne, but it also moisturizes and offers protection for your skin. Sebum is an oily, waxy substance produced by ...