Not a doc or anything, but I was recently diagnosed w/ a stress fracture in my 3rd metatarsal. It was extra sensitive in one spot and my doc had me try moving my toes w/ resisitance (him holding them down/up) to determine whether it was a tendon issue. There was (is) a general slight swelling across the top of my foot and it was rather warm.

Best bet would be to go see your doc for either x-rays (apparently stress fractures of the foot show about 3 weeks post-injury) or a bone scan to confirm.

Oh, and here is a site that was rather helpful in my self-diagnosis. http://www.foottalk.com/stressfx.htm

Thanks for the info and the link!

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Mike Hollywood
http://www.bostontriathlonteam.com
http://www.michaelhollywood.com

Also, you might want to rule out simple bruising caused by lacing too tightly.