Rinse your hair thoroughly after shampooing or conditioning. Any residual product left on your hair that makes contact with skin can clog pores and cause acne blemishes.
Wash your forehead with non-comodogenic facial soap after applying hair products to the front part of your hair. Hair gel, spray, mousse or pomade clog pores, too.
Keep your hair off your forehead whenever possible. Bangs can make the forehead hot and sweaty, leading to clogged pores and pimples. Pin bangs back at night.
Remove caps and hats whenever possible. They also make your forehead sweaty, which can result in pimples.
Change your pillow case frequently, or lay a clean towel on top every night.
Wash your face no more than twice daily with a gentle cleanser. Washing more can result in overproduction of oils, a leading cause of acne.
Avoid touching your forehead or popping pimples. It's a hard habit to break, but touching the affected area transfers oil and dirt.
Use a mild, over-the-counter acne product and apply directly to the forehead as directed.