Is retinoid skin products safe for teens?

My 15.5 has struggled with acne for 5 years. At first sign I took her in to see a doctor. He prescribed medication that had 5% benzoyl, which we found out later she is allergic to. We have found some natural products she is able to use. For the past 2 years she still has some scarring on her cheek that has not gone away. Would it be safe for her to use retinoid skin products or would it work for her?