Benzoyl Peroxide
One of the most common topical treatment ingredients, BP (as the cool kids call it) is found in everything from cleansers to spot treatments. And while it works by killing acne-causing bacteria, there's no reported resistance to benzoyl peroxide, points out Zeichner, meaning you can gradually taper off use. Regardless of the type of BP product you're using, he recommends applying it every other day, gradually getting down to just once a week. While he says it's usually not recommended for pregnant women, Gilbert points out that it may be a case-by-case basis. Your best bet (as it is for all of these)? Discuss your specific skin issues—and the products you're using or meds you're taking—with both your derm and gyno.
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