I have calcification, found lots of small movable lumps, is it serious?

I’m 58 and 5 years ago I had tests where they found I had calcification!
Tonight while using the flat of my hand and feeling under my arms and up over my collarbone I found lots of small movable lumps! Should I be worried ? I am having a full knee operation on 9 February, is it wise to get these lumps checked out before I have my operation?