I have two lumps on r. lower breast so i had a mammogram and ultrasound where they confirmed the lumps but not much breast tissue. is there concern?

Exam: There is no substitute for an appropriate exam and discussion with a surgeon. Even if imaging suggests these are probably benign, there are instances were the lumps would warrant further investigation. Imaging is not perfect and mammogram/ultrasound can miss breast cancer. Please see a surgeon in you area.

It depends: It all depends on what the lumps looked like on mammo and ultrasound. They could have benign features, or suspicious features. No way to tell without further information.