Moisturizers prevent and treat dry skin, but that's not all they do. They can protect sensitive skin, improve skin tone and texture, and mask imperfections. In fact, you can probably find a moisturizer that claims to address whatever concerns you, from dull skin to clogged pores. On the most basic level, moisturizers hold water in the outermost layer of skin and act as a temporary protective barrier. Many moisturizers contain some combination of humectants and emollients, as well as other ingredients.

According to the National Institute of Arthritis, Musculoskeletal, and Skin Diseases (NIAMS), acne is the most common skin ailment in the United States, affecting nearly 17 million Americans.