A pregnant adolescent seeks treatment for blackheads. which drug would be safe for the adolescent?

During pregnancy, most drugs like retinoids or tretinoin are used to treat blackheads or acne are not safe to use for their safety is not known and most of them is in category C drugs, which means that they are harmful to a developing fetus. However, benzoyl peroxide is the only acne products that are safe to use during pregnancy.