Take it from a longtime Differin user: This is the best time to stock up.

The main ingredient in Differin Gel is adapalene, a type of retinoid, which treats acne and premature aging from sun exposure. Yahoo Sports ...

"Hearst Magazines and AOL may earn commission or revenue on some items through these links." As an acne-prone girlie, pimple patches and Differin are nonnegotiable restocks during Amazon Prime Day.