I am an 18 year old woman. I consider myself to be pretty healthy and I try to stay active. But lately for the past month, month and a half I have been getting a warm sensation on the side of my left foot below the ankle and the whole outer side of my left foot. It happens a few times a day. Some days it happens once or twice a day and then other days it will happen multiple times a day. I don't have any other symptoms than the warm sensation and sometimes I don't really notice that. Its not painful it just gets warm. I'm not sure what could be causing this. I did sprain my ankle about 7 months ago, but that's fully healed. So what could this be? It just came out of nowhere.