what causes pimples on forehead
Styling gel, smoothing serums, hair spray and other hair products can cause acne on your forehead if they have a chance to accumulate there, says Susan Binder, a New York City-based dermatologist in Glamour magazine's daily beauty blog. If you have bangs, your forehead may be even more acne-prone.
Not washing your face before you go to sleep can cause breakouts on your forehead since makeup residue has a chance to slip inside your pores, says Bay Area dermatologist Katie Rodan in Allure. Rodan explains that your face heats up while you sleep, making it easier for anything on your face to penetrate your pores.