When following rhinoplasty can I resume using tretinoin? 10 days post op.

Hello! I’ve been using tretinoin for acne for many years. I’m about 10 days post rhinoplasty, when can I go back to using tretinoin directly on the nose? And is it okay (as I’m doing now) to use on the other areas of the face not directly on the nose? Also, I used tretinoin pretty much to the day of surgery (I read now that shouldn’t be done) and I’m seeing a lot of dark discoloration around the tip, is the discoloration a result of the tretinoin? Thank you!