I suffer from acne and also have blackheads on my nose. I have been using tretinoin for years. I use it every night and apply it all over my face. I also use clindamycin gel cream for my face in the morning--but I stopped using it on my nose. I started using Paula's Choice 2% BHA on my nose in the mornings. But I still don't see much of a difference on my nose. What should I do?