I've asked loads of questions today but is the spot a disease it don't look like a mole either and the spots been there for a long time
I don't think it's ring worm it looks like a mole but it's redish and is likes spot
Herpes is nothing to be ashamed of. you must make sure that you talk to anyone who as been in contact with your leg, and if you can't stand to talk to them, just say something about cold sores. leg amuptation is probably the only safe course of action from here... look at some awesome prosthetics on this site. http://www.oddee.com/item_98359.aspx
It could be ringworm. Here's some more information on what it is &how to treat it...