If multiple Ts have brought it up it might be wise to work on the issue. It's not just going to go away if you ignore it or deny it. I don't know what the therapy is for that. For borderline so there's DBT and it a lot of hard work. Wether or not it's put down in black and white as a diganois doesn't matter as much as you deciding that it's a issue in your life and causing problems. If it is then work on it, don't try to deny it or like many other try to get a different diganois.