Haze, it ain’t nothin’ until a tests says it’s somethun’.
Chill.
The Human body is…irregular.
Like a factory second.
Or, maybe your pants are.
Chin up. You got no news.
My dad recently underwent surgery for a similar problem – a weird mass, didn’t hurt, but it was definitely there – on the back of his left shoulder. It got to the point that his doc said “boy or girl?” when examining him.
It was a totally benign fatty cyst that kinda took over the near universe (or his shoulder, depending on your definition of “universe”). I sincerely hope yours turns out as un-interesting as his did.
For a benign cyst, do they do surgery to remove it or just leave it alone?
When my dad was in the service, he was on guard duty in Germany. It was really cold and he forgot his gloves so he copped a made-up excuse that he had a pain in his arm. They sent him to the medical dudes and (as luck would have it), he had some sort of benign tumor in his arm (no biopsy…not sure how they found it). Anyway, he did nothing, and now 55 years later, still no problem. Just one example, but I hope your issue turns out to be no biggie.
Benign cysts often require surgery, especially if they impinge nerves or muscle. It’s usually minor, though.
The right kind of cyst story can get you valuable Doper points in the next zit thread. 
Again, out of my comfort zone of knowledge. But, I am under the strong impression that eventually they remove even benign cysts as they can continue to grow and cause discomfort. Just not the high priority a malignant growth would be. Again, IANAD or Nurse.
Jim
What I’d say is don’t assume the worst (MFH is pretty unusual), and see if your doc can get you set up for a diagnostic procedure sooner so you don’t have to worry for so long. A fine needle aspiration (FNA) can usually get you an answer within a day (sometimes within minutes, depending on what the cause of the mass is), and it’s minimally painful.
This site provides a fairly accurate description of FNAs, though in my experience in performing them (and in the literature in general) patients don’t have to wait around to be observed for hours afterwards - more like a few minutes.
Best wishes.