Hard Lump outside of right foot?

[xmasfriend]

have a hard lump on the outside of my right foot. It's about halfway between the little toe and the ankle and about the same size as a grape.
It doesn't hurt and it feels kinda numb to touch..?! Although I can feel it pushing against my shoe, but again, doesnt really hurt

I don't know What it is... I'm pretty sure it isn't a bunion...how big do they get? And where do they form?

I'm hoping it's nothing cancerous or that I have to have my foot off... - (extreme worrying)

I have an appointment with the Doc on Wednesday, so thats a bit of a weight off my mind :/ .....

http://www.flickr.com/photos/2535693...in/photostream

does anyone have any ideas what it is?

Sounds like a ganglion cyst.