Swelling in lower belly after lipoma removed from above belly button size of a large mango, 10 days post, is this normal?

i had a surgery 10days ago of lipoma removed from above my belly button and below my ribs. the cut id from between my breasts to right above my belly button. surgeon said they had to fix my muscle wall gaps too. lipoma was quiet bigger then a tenis ball. now my lower belly has swollen above 9inches and not reducing. is it normal?