Armpit swelling/discomfort

Hi everyone.

Just looking for some advice or words of wisdom from anyone who has experienced something similar.

For quite a few months now I've noticed my left armpit is puffy compared to my right - it causes pain/discomfort but not all the time although I feel it's recently got worse. I first noticed it when I was pregnant earlier in the year (I sadly miscarried) but feel like the puffiness/swelling/soreness has remained.

There's no lumps in the breast or armpit that I can feel, I visited the GP in September who did a thorough breast/armpit exam and had no cause for concern.

However it hasn't gone away, I have another GP appoitment on Wednesday and hopefully I can be referred.

Has anybody experienced anything similar?

thanks for reading - I'm 35 by the way.