Thanks for choosing helthcare magic .
With the desription you have give i am suspecting it to be a lipoma
. Lipoma means a localised collection of fat tissue which basically is a harmless condition .
It can be removed by simple excision . usually done for cosmetic reasons or in case of any secondary complications.
Otherwise no other treatment is needed
But it is not possible to arrive at a definite diagnosis without a proper physical examination
hence i suggest you meet a surgeon and rule out other causes