Re: unknown sore spot on side of toe..please help
To try and figure out what it is I would suggest going to google and start searching under images for various foot issues; corns, bunions, cysts etc. By no means is this the perfect solution to your issue but if you can figure out what it is then maybe you can find a way to get some relief. You will most likely need to get some sort of medical attention at some point but if you can figure out what is going on at least you will be a few steps ahead and if nothing else have some peace of mind which is a wonderful thing.
This is just my two cents.