Can I use Retin-A on my lips to treat fordyce spots?

First, I would seek a professional to make sure they are Fordyce spots vs something else (if you haven’t don’t so already). These spots are oil glands and can form tiny whitehead-like bumps. Do not squeeze them. Tretinoin at a low strength may be able to help, but use at a low strength as the lips are thin and can become irritated.