post keyhole colonoscopy lump

hi,

where one of the incisions was made during my colonoscopy two weeks ago, a lump has developed. It feels like a ball of gristle and isn't too tender to touch but it is there and the size of a pear drop sweet . it's two weeks post surgery and the swelling has gone down to reveal this lump..any ideas on what it could be and why it is here?

thanks in advance