Hi I'm undergoing treatment for secondary breast cancer letrazole, abermacicli and denosumab although latter being suspended due to COVID till March, I've noticed swelling in armpit only occasionally but I'm due to go back to work and this is worrying me due to nature of diagnosis should I be concerned,  I've had total hip replacement cancer in this area and another untreated in spine, at moment feeling ok but swelling troubling me 

thanks