Fatty lump under 1 armpit after 1 child? (Photo)

Thank you for the question. Your concerns are not uncommon; many women have concerns about the same areas. Sometimes, liposuction surgery alone will suffice; in many cases, the "excess" skin, adipose tissue, and breast tissue need to be directly exercised in order to achieve the desired improvement in contour. In those cases, liposuction surgery alone may leave patients dissatisfied with the residual (possibly irregular) skin in the infra-axillary areas.

In terms of selection of your plastic surgeon, I would suggest starting with the American Society of Plastic Surgery and/or the Aesthetic Society of Plastic Surgery to obtain a list of well experienced board-certified plastic surgeons.
Then, I would suggest you visit a few surgeons whose practices concentrate on aesthetic surgery. Ask to SEE lots of examples of their work AND preferably speak/see patients who have had similar procedures done.
Be very careful with your decision-making. You will find, while doing your due diligence, that there are many different “specialties” who will offer their services to you; again, I strongly recommend you concentrate on surgeons certified by the American Board of Plastic Surgery.

Best wishes.

The Tail of Spence is a natural part of breast tissue in both men and women.  This breast tissue develops at puberty, and normally turns to fat by the age of 15.  Apparently, you had asymmetric breast tissue in the two armpits.  This is no more unusual than having asymmetric breast which is actually the rule rather than the exception.  From your history, it would appear that because of more breast tissue in the affected side than the contra lateral side, you developed a lump in the one Tail of Spence.  The fact that it has been there for 4 years without any problems would indicate to me that is not fast growing, therefore the possibilities are degenerated breast tissue (fat), breast tissue, or a benign fatty tumor known as a lymphoma.  The shear fact that it has been there for 4 years makes the likelihood of anything fast growing such as a malignant tumor very unlikely.  If I were a betting man, I would bet that this is just degenerated breast tissue with asymmetric armpits, and if you were my patient, I would liposuction this out through a small incision in the armpit.  I am glad to see you put this question up on RealSelf since Board Certified plastic surgeons deal with this problem every week.  I recommend you find a Board Certified plastic surgeon in your region who has significant experience in liposuctioning out the Tail of Spence.  Normally, I would discard this liposuctioned tissue, but since both you and your gynecologist appear to be concerned, it would be highly appropriate to send the suctioned material for pathologic examination.Please don't worry.  Your story and photograph are consistent with a benign lump.