 [ Symptoms ] what is causing a knot on the left side of my abdomen parallel to belly button  i am 19 and parallel to my belly button on my left side there is a round knot about the size of a small marble i have noticed it for a while and it has not gotten any bigger it is sometimes painful if i move a certain way i have to really push down to find it on my stomach i am also a diabetic almost 19 years and on an insulin pump could it be scar tissue from injection sites it doesnt really hurt when i try to pick stuff up it also hurts sometimes on my right side where i had sites [ Disease ] get your apendix checked out