Which doctor to start with for pain?

I haven't been on here for years, but now I'm having a lot of pain in my right breast. It's the one that had surgery and rads. A few years ago I had mastitis [corrected] where it blew up ridiculously large. Antibiotics took care of that. But ever since then it's been thick and lumpy all over. My yearly mammo in January came back clean (except for the usual "very dense").

Now my question: What type of doctor should I start with to diagnose ongoing sharp pain? It's interior as well as exterior. Sometimes just brushing against the surface feels like I have a huge scrape there, but the skin is perfectly fine. It hurts when I'm trying to go to sleep, and at random times during the day.

I haven't seen my ob/gyn since I had a hysterectomy a few years ago (I'm now 60). Haven't seen the oncologist in 10+ years. My surgeon really was no help with the mastitis. Any suggestions? Thanks!