Topical genital treatment?

Hey, I’ve been on T for almost two years now and I’ve recently noticed that being vaginally penetrated is kind of uncomfortable now, even with lube. I remember reading that you can get some sort of topical estrogen treatment to help with that - does anyone know anything about it?

If it’s not a potentially destabilising idea, is it prescribed, or can I just get it at the pharmacy? And would it be a better idea to bring it up with an endocrinologist or a gynaecologist?