Thank you for writing.
After my children, I got this too. This tissue is known as accessory axillary breast tissue. I still have it, it's in the crease leading to my underarms and is quite puffy. I'm not a fan of it but I assumed there was nothing to be done.
I did a little research about a year ago and learned liposuction is not recommended because it's not fat, it's breast tissue and body tissue should not be removed via liposuction.
However, I see that many plastic surgery centers do offer liposuction for this issue. Maybe techniques have changed. Lipo in the area of the crease should not cause scarring (or it should be minimal.)
Some surgeons that remove it surgically (via incision) say that with their technique, scarring is minimal.
My advice is to talk to your gynecologist first and then consult with a board certified plastic surgeon and make up your own mind. Good luck - if you decide to do it, let us know!