I would get an appt to see your dermatologist or even PCP. With the redness and rash extending from it looks infected and that you may need antibiotics. In the meantime, keep it covered with non-stick bandages and neosporin.

Wow, will It heal better than that?

After surgery

This is a picture before surgery and then after

Do you have a doctor you can see?

https://www.hs-foundation.org/hs-specialty-clinics

Here is a list.

Covering with a wide bandage or gauze and tape. Lil Neosporin or Vaseline just enough to cover the hole helps with friction. I have this under my breast too. I plan to eventually have surgery for it. CO2 laser. I have seen pictures of women taking Humira and it helps. So again look for a doctor. Please refer to the list or are local dermatologists who has patients with HS. Just look up online in your area and ask them when you call if any dermatologists in the office deal with patients town HS