welcome to Health care magic.
1.It could be a benign mass, fat , cyst
2.But you can not just ignore the condition.
3.Get an appointment with your doctor and let the doctor examine your lump and get an ultrasound
4.An ultrasound will help to find the nature of the lump, and where it is existing from, what it is involving ( adjacent structures ) and an FNAC for confirmation that its harm less.
5.After that if it is causing discomfort / pain it can be excised or else just monitored.
6.Please do not just ignore any thing like breast lump. Take needful action.
Hope it helps you. Wish you a good health.
Anything to ask ? do not hesitate. Thank you.