 She says viral beauty products can contain active ingredients like retinol or glycolic acid that can be too harsh for pre-teen skin. Instead, she says teens and tweens should stick to a gentle cleanser, mild moisturizer, and sunscreen. She says over-the-counter products like benzoyl peroxide are fine for teens with acne, though it's a good idea to check in with a pediatrician or dermatologist. Maria Godoy, NPR News.