Last week, I was barefoot in some pretty bad weather and ever since my foot has hurt. I have tried to ignore it, but today, I could feel something moving back and forth on the top of my foot. I am experiencing pain and when you touch the top of the foot, you can feel something striating back and forth. Can you give me some advice as to how to handle this and what it might possibly be? I have a high threshold of pain and it's rather difficult for me to determine if this is worth medical attention.