Hello, I finished breastfeeding almost 8 months ago, stopped feeding a…

Hello, I finished breastfeeding almost 8 months ago, stopped feeding at 2 months, didn't express as milk was already coming out normally and there were small lumps in my breasts. I had an ultrasound 4 months ago, they said everything is fine, it's just the breast tissue. You need to do massage and it will go away. But now there are many painful lumps under my arms. Should I wait or see a doctor? How did you experience this?