What is This Hard Bulge after Tummy Tuck Surgery?

I, like my colleagues, believe you had a mini tummy tuck but when I enlarged the photos I saw sutures around your belly button which may mean you had a full but it is very confusing. It appears that you could have more skin resected. Of the remaining skin, you appear to have swelling but I cannot explain why it is so profound. It could be due to improper garment wear. Manual lymphatic drainage could help.
 

It looks like fluid accumulation. A simple test is to have a ultrasoud performed that will show if fluid is present and then have it tapped or a catherter placed.

Sorry to hear that you're not happy with your result.  Your photos are very telling and I've read some of the other colleagues statements.  Some I agree with, some disagree.  As far as saying that your result is very good (which I read posted) I can't really agree with that unless I know what you looked like prior to surgery.  That is all telling.

As far as you having a mini tummy tuck, I also disagree with (even though most of the postings say that about you) because you said you have a new belly button.

Ultimately the statement that we all agree on is that we'd need to see what you looked like prior.  Not all tummy tucks will look the same after they're done.  No, your abdomen is not the perfect shape, nor was is prior to surgery but the question is, how much improvement was there.

The firm area is likely an area of poorly perfussing fatty tissue in your abdomen that will need to be opened up.  It's typically near the incision and it happens typically when patients are overweight.  That may or may not be your case, but you certainly need to reconsult with your board certified plastic surgeon.

Best wishes