I have had some pain under my first metatarsal for the past couple of days. The only thing is, I only feel the pain when I apply pressure to that one area. The pain isn't overbearing, just uncomfortable. This happens when I am using my tennis ball under my foot to massage the muscles on the bottom of my foot. Sometimes when I run I feel it, but I can mostly avoid it since I land on my outside metatarsals. What could this possibly be? More importantly, how can I get it to go away?