Is Fibro Edenoma In Breast Normal?

hi i am 28 years i got a breast ultrasound because after breast feed my baby 3 years ago i got a breast ultrasound because i found something hard in my right breast the doctor said was nothing and live it
so i believe what the doctor told me but on Friday last week i go back and do my next breast ultrasound and the result said a high frequency sonography of right breast reveals and ovoid less echogenic nodule of 1.0 x .5 cm in retro-areolar area.There is no calcification see in it .The apperance is cossistent with high probability of being a lesion i.e fibro adenoma my doctor said is nothing live it is not necessary take it out so what to do? for a better explication