Is a breast biopsy needed

I had a breast reduction 3/09.  9/09 went for my annual mammogram and was asked to return for more views because of asymmetric breasts.  Returned for more views and ultrasound on 10/14.  Impression on Ultrasound says the following:  Hypoechoic 5.5 mm lesion at the 9:00 radian 5 cm from the nipple in the left breast.  Comment:  At the 9:00 radian 5 cm from the nipple a hypoechoic 5.5 x 5 x 4 mm round lesion with no through-transmission is noted.  There is slight attenutation of the sound beam.  There is no internal flow on color doppler.  The lesion is nonspecific in appearance.  A BB was placed over this region with the patient in a left-side-down decubitus position in attemps at mimicking the ML mamographic position.  The lesion is best demonstrated on the ML mammographic view.  Followup mediolateral mammographic imaging reveals finding on the mammogram correates with the songraphic finding.  In light of its sonographic appearance further evaluation by breast surgeon would be beneficial.  This would be amenable to percutaneous sampling for histologic evaluation.  Further workup should be based on clinical and mammographic parameters.  Do I need to have a biopsy or can this be followed?   This was not picked up on the additional views of the mammogram.  It just showed on the ultrasound.

Also, mammogram has the following:  There is a 0.7 cm area of reduced density defined by a thin wall with a small amount of calcification at the right 9:00 position consistent with fat necrosis.  This is in the vicinity of the ultrasound lesion.  

At the 3:00 position is a 0.7 cm smooths nodule.  The margins are sharply defined.  This can be managed with surveillance and a six-month followup mammogram and ultrasound is requested.  So does this mean that the one on the ultrasound needs immediate attention and the one on the mammogram can be looked at later?  So much here that I don't understand.  Appreciate your guidance.

[katarina777]

If it was me, I would follow the recommendations of my doctor.
Your doctor would also be the best person to ask about explaining this all to you. There is no way we here can make better suggestions and recommendations to you than your own doctors, and  who know your history and the context of  all factors involved. Katrin