So while technically not a serum, this new acne-fighting lotion is getting rave reviews and quickly attracting a mass following. The Nerd Skincare acne line includes everything from a cleanser to a cream, and this light, serum-like lotion is queen for helping you battle breakouts. It has all of the good stuff that serums have: glycerin, protein and plenty of natural ingredients, but none of the tough stuff that sets sensitive skin aflame. Instead of salicylic acid and benzoyl peroxide, Nerd uses sulfur to clear breakouts and cultivate a strong skin barrier.