Hi,Dear, Thanks for the query to HCM. I studied your problem in depth and I understood your concerns. Causes for lump below nipples in abdomen- Cause is related with undisclosed super-numery polymastia in few cases and is a congenital anomaly.So they are undisclosed breast tissues.So please consult ER Surgeon and Gynaec. This advise is based on the facts from the history you give and needs further clinical check. So don t build up wrong concepts and create more psychic complications in you which would increase risks and costs to you, but just ask a query to HCM and be comfortable to resolve your health issues. Welcome for any more query in this regard to HCM. Write good resume and Click thanks if you feel satisfied with my advise. Have a Good Day. Dr.Savaskar M.N.