Foot/hamstring issue

I don't know that these symptoms are related, but I have a knot in the middle of the bottom of my foot and tenderness where my hamstring meets the glute. This started about a week ago; a couple of days after a long run. Yesterday, I biked/ran/biked and limited the run to 60 minutes. It isn't as bad as last week, but is still bothering me. Any ideas? Thanks! Lisa