Many of us have been there: after squeezing a whitehead we shouldn’t have touched, we start searching the bathroom cabinet for something that might calm the situation. One product that often turns up is the familiar brown bottle of hydrogen peroxide. It’s known for various at-home uses—everything from disinfecting to lightening hair—and it’s also rumored to help dry out pimples quickly. If it really worked that well, though, it would likely be a staple in acne care. To unders