YES. I was coming here to ask the same thing. I get this at least once a year. It last about a month or so, and then it's gone. I too have rushed to the ER to be told it could be breast cancer. That was years ago. I find wearing tight bras or getting a cold make it flare. I do best if I do not shave my armpits too far down,and wear sports bras.
I went to my primary care several years ago, and he told me to go to a good rheumatologist and be checked for Lupus.
I currently have this flare. It's been lingering for about a week or more. I wish it would go away. It feels like mastitis, that's the only way I can think of to describe it. Horrible mastitis that will not go away.