Hello,
Welcome to Healthcaremagic.
From your query, i suspect you may have
Fibroadenoma breast.
It is a benign tumour.
It is most common in women.
You have firm small lump, it is usually benign.
Cancerous lumps are harder and irregular in size.
Physical examination by doctor is needed to differentiate it from benign and malignant.
Breast ultrasound and
Mammography are helpful in diagnosis.
Biopsy may be done to get a definite diagnosis.
Lump may be removed or left in place.
It is very rare to be a cancer.
If the lump is left in place and to be watched carefully, it may need to be removed at later time if it grows rapidly or changes in consistency.
Hope this helps.
If any doubt, kindly reply.
Take care.