Can I use my acne medication while breastfeeding?

Q: I'm breastfeeding and have some acne. Can I use products containing tretinoin? 

A: The oral version of this medicine, Accutane, passes into breast milk and should never be used by nursing moms. The cream versions are known as Retin-A or Renova; like virtually every other topical cream or lotion, their transfer into breast milk is zero, or nearly zero, so they can safely be used.