The outside of my right foot is numb...Any ideas?

Lots of ideas. The vaguer the description, the larger the number of possibilities. In this case, it can range from merely annoying to truly ominous. On the truly annoying side, you could have sat wrong for a while and not part of your foot is "asleep." there is also a foot condition similar to carpel tunnel syndrome (but that usually affects the inside of your foot). More info would help in this case.
Needs attention. . This can be caused by a number of things, including shoes being too tight or a poor fit. Some causes can be serious such as circulation and nerve problems such as peripheral neuropathy. Seeing a physician would be indicated to confirm a proper diagnosis and treatment.