About 2 weeks ago, I noticed that the top of my left foot, especially my outer three toes, felt partially numb. At first I just thought that my foot fell asleep and that the sensation would go away. However, its been 2 weeks and nothing has changed. If anything my foot feels worse. It doesn't seem to make a difference whether I'm running or not and since there is no real pain associated with it, I've been able to continue running. But, when I touch my left ankle, I feel a tingling sensation throughout my foot, and in general my foot just feels really uncomfortable and it's unsettling that this bizarre sensation has not gone away or been alleviated at all. Does anyone have any idea what could cause this or what I should do?