On Sunday I noticed a pain when walking after a short while. I found I had a small lump on the top of my foot , approx midway between my ankle and the toes, you would get to it if you traced your finger from the space between my small toe and the next toe mid way up before arriving at the ankle, not sure if I ve explained it very well. Now it really hurst to walk at times, and it really hurst if I touch the lump, and the lump has got bigger. Any idea what it could be?