11 months post mommy makeover, could hard area above belly button be a seroma this far out? Swelling varies (photos)

Imommy makeover on 1/28/22 and the drains were removed to early. I then had to have new drain put in that again was removed to early and had to be manually drained. Around 5-6 months post op I noticed a hardened area above my belly button. I am working on trying to get revision but the dr I went to is having a hard time determining what this is. He is thinking it’s a seroma could I have one after this long? Sometimes it more swollen then others.It’s between the abdominal wall and skin that moves