What is this bump under my skin? Hidradentis supperativa? (photos)

5 months ago I got this bump under my skin and sometimes what looks like red flesh comes out and goes in but hard bump is always there. I got diagnosed with hidradenris supperativa but not 100% sure because I have ONLY this one bump between my legs and no where else but also no bacteria or infection so not sure what it is. I've been advised to surgically remove it and hope it won't appear in another spot since it hasn't yet. Is this HS? Should I remove surgically since medication don't work?

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