Dry skin on cleavage leaving darken skin after healing

I really feel you on this, it sounds so uncomfortable especially when you are already dealing with so much during this time. The darkening after the skin heals is really common with that kind of irritation, but since it keeps coming back and leaving marks, it might be good to bring it up with your PD or gynae on your next visit just to be safe. You are not alone in this, many of us have gone through similar skin changes, so hang in there.