What Causes Raised Area At The Surgical Site?

I recently (February 26th) had arthroscopic surgery on my shoulder I had my Glenoid component removed from my artificial shoulder, scar tissue and fluid and also 2 tissue samples for biopsy. My one incision in the front has a buldge that was not there on March 1st when the bandages were removed. It was there on March 2nd when my pain pump was removed. Is this a reason for concern ? Area is not red or warm to touch. Just raised up. Thank you I don t wish to put my credit card info on line didn t know there was a charge sorry I wasted our time