Hi. Lumps of fat u are describing is lipoma.it is a benign condition.sometimes many lumps upto 100 can occur which is called ADIPOSA DOLOROSA.
The etiology is unknown.studies are there to suggest heriditary.particle chromosomal pattern and number.nutritional and metabolic factors are responsible for causing lipomas
.sometimes fat along muscle is involved which is called lipomyoma.
Treated is needed for cosmetic look.rapid growth.obstructing vital organs .treatment of choice is only excision