Will Retin-A affect the Nexplanon implant I've had in my arm for almost a year now?

The retin-a should have no effect on your birth control.  It is fine to use it with implants, IUDs, and oral contraceptives.   If you want to check with your prescriber, that would be great.  Best of luck!

Hello and thank you for your question. With topical medications, you typically do not have to worry about systemic effects since there is minimal systemic absorption. With that said, I would recommend a consultation by your board certified provider for evaluation and discussion of appropriate treatment. Best of luck.