Q. Years ago, when I was a young teen, my acne was so bad that my pediatrician recommended seeing a dermatologist to prevent scarring. Thankfully, my parents agreed. In addition to not ever eating chocolate or drinking a Coke for a few years (I was committed!), I used a pink lotion that the dermatologist supplied. I applied it religiously each night. After a while, my acne cleared up.

The pink lotion? We discovered the key ingredient was milk of magnesia. My daughters applied regular milk of magnesia as teens, and it also worked for them.