I had foot surgery in May, two extra bones removed, and tendon work done. On the top of my foot there has been a little bump. I thought it may be a pimple and I picked at it, and it itches. It is not a bite because it has been there a while. Now the top of my foot feels squishy, and you can push it in and it will stay sunken in in that spot, but it does swell back up. Should I be concerned?