Hello! I read carefully your query and understand your concern. It is hard to tell exactly what it is without seeing or feeling it. You really need to see a physician to have the lump physically examined. Factors such as associated pain, discoloration, rate of growth of the lump, will help your physician decide if the lump is of concern. It might be a lipoma (benign fatty lump that usually causes no symptoms ).In this case it is a soft, squishy lump, well circumscribed, mobile. It also might be something serious (it the lump is hard,immobile and not well circumscribed) and to exclude this you should get examined and probably run some tests and investigation including Abdominal ultrasound. I strongly suggest to consult a physician and get examined. Hope my answer has helped. Take care. Dr.Rovena