Over-the-counter topical treatments that contain anti-acne ingredients such as salicylic acid and erythromycin are safe and effective alternatives to medication. Gentle facial scrubs can keep pores clear. > Try Good Skin All Right Medicated Cleanser, $12.
"Some acne medicines absolutely should not be used during pregnancy," says Doris Day, M.D., a New York City dermatologist. Accutane, which may cause birth defects, and any other vitamin-A-derived treatment (such as Renova and Retin-A) should be shelved until after pregnancy.