I was 17 when I told T1 about it for the first time. She said that if I didn't stop doing it she would have to tell my parents (She never did, though).
She asked questions like where I used to cut, what tools I'd use, how many times a week I'd cut, the depth of the wounds, etc.
This was a very hard topic for me to talk about, so I'd never bring it up unless she did first.
She asked about it a few times, but stopped doing it after I turned 18. I don't know if it had something to do with me not being underage anymore, but I always felt like this topic made her uncomfortable. I was doing CBT at the time and I wanted help with finding new coping mechanisms that could I use to replace the self-destructive ones... but not feeling understood by my T made me give up on seeking help.

Pdoc asked about the places where I used to cut. She asked if I was doing it on my stomach (I don't know why she asked this), and if I had ever had any wounds infected.
She seemed relaxed when talking about it and this made me feel a little more comfortable.

I haven't self-harmed in almost 2 years now. I'm happy that I've come this far, but recovery has been a very lonely journey for me.