Hi, I had the same type of bunionectomy as you on Dec. 17th and my foot was very bruised & swollen. I wondered what the heck they had done to my foot, but it's really normal. I'm actually still bruised, & swell a bit now, too, at day 22 post-surgery. It's much less than it was, thank goodness!
I started physical therapy yesterday & asked the therapist how come my whole foot was bruised when I only had surgery on the bunion & heel. She said that it's normal and just a part of how your circulation works when you have surgery.
It will get better, it just looks scary. Elevation helps with the swelling, that's for sure!
Take care!
Kathy