Is it normal that Retin-A is making my post-acne red and brown marks worse?

I have many red & brown post-acne marks. I've been using Retin-A (.025%) for 2 weeks now. I started using it every 2 to 3 days since I'd get really dry skin. After a week, I had no dry skin so I've been applying it (a pea sized amount for my entire face) every night. I wear SPF 55 everyday. I've noticed my skin is no longer textured/rough or bumpy. But my red and brown acne marks seem to have gotten larger & darker, is this normal? Should I be concerned about the hyper-pigmentation? Thank you.