I have a big 'ol bone spur right below/forward of my ankle, and it did hurt like balls when I skied.
Honestly, the best remedy is to punch it out. Sucks to pay for it, but it's only like 10 bucks and it worked like a charm. It really is something you want to take care of, because they only get bigger when irritated.
Even though that isn't what you asked
It's probs a bone spur, yo