14 Common Skin-Care Mistakes Dermatologists Say We're Guilty of Making

Skin-care mistakes aren't limited to just your face. In fact, one of the biggest mistakes Dr. Marchbein encounters has to do with not changing your razor blade often enough.

"Ingrown hairs, folliculitis (inflammation of the hair follicles), and irritation of the skin can happen as razor blades become dull," she said. "For best results when shaving, I recommend changing your razor blade every two to three shaves."