Is it normal for a cartilage graft to swell but not the surrounding tissue? Was the graft too large? (Photos)

I had a revision rhino/septoplasty 6 months ago to resolve two small, sunken divots in my anterior lateral cartilage that developed after a car crash. My surgeon placed diced septal cartilage grafts, but didn't do any other external work& no other areas were really swollen. However, I have significant swelling where one of the grafts was placed. It looks like a grain of rice was sewn under my skin. I’m worried the graft is too large. Is this normal? I have medium skin thickness.