3 doctors weighed in:

I have a big lump under my left armpit after delivering a baby?

3 doctors weighed in
Dr. James Ferguson
Pediatrics
2 doctors agree

In brief: Breast tissue/glnd

In that location the most common lump would be an enlarged lymph gland.
One rare possibility would be stray breast tissue. If you draw a semicircle from the armpit thru the nl breast location along the mid belly to the groin on the same side, you have the line where accessory nipples(usually duds) may be found. I had one mom that had an accessory breast tissue in both pits arise after delivery.

In brief: Breast tissue/glnd

In that location the most common lump would be an enlarged lymph gland.
One rare possibility would be stray breast tissue. If you draw a semicircle from the armpit thru the nl breast location along the mid belly to the groin on the same side, you have the line where accessory nipples(usually duds) may be found. I had one mom that had an accessory breast tissue in both pits arise after delivery.
Dr. James Ferguson
Dr. James Ferguson
Thank
Get help from a real doctor now
Dr. Jane Van Dis
Board Certified, Obstetrics & Gynecology
14 years in practice
47M people helped
Continue
108,000 doctors available
Read more answers from doctors