2 years post op and experiencing soreness in armpits and side boob, is this common?

It's not common to experience soreness on a regular basis two years after surgery. It's difficult to determine if this is related to your surgery, hormonal changes, or potentially the fit of your bras. I encourage you to visit with your surgeon for an evaluation to rule out any concerns.

Thank you for your query. It is very unusual to have soreness in the area, this late after surgery . It is difficult to say without any pictures and without examining you, but an ultrasound may be of help. Please make an appointment with your Plastic surgeon who can examine you and help you with all your concerns. All the best!

You probably have excess breast tissue in the axilla and side areas which does sometimes get sore when hormones fluctuate. If need, more from these areas could be removed. Go back to your surgeon or find another and discuss your concerns.