I had amammogram which showed dense tissue in my left breast. I was having my 40 year old routine mammogram. I have been noticing increased swelling in my left breast for about 3 months now. I started feeling a difference in my left armpit while shaving about a year ago. It's not a lump but like a raised area. It didn't bother me until a month ago I feel like a pinching sensation from my armpit to my nipple. My doctor said it's probably nothing. I did have another mamogram and right after the radiologist ordered an ultrasound of my left breast. They said there was an area of concern on my outer breast and ordered a mri. The mri was ok and they said to have another mammogram in 6 months just to follow up. I was wondering if I needed an ultrasound of my armpit to diagnose lymph node issues or would it have shown up on the mri or ultrasound of my breast.

                                                   thank you