Mastectomy - 3 years later and I'm now getting sharp breast pain. Could this be scar tissue?

Hi  I had a mastectomy 2023 and I am now getting a sharp pain in the breast area I have to undo the bra and wait for it to go. I am thinking this is scared tissue pain ? 
I have had a mammogram and that is clear :)

look forward to hear from you and thank you in advance.