You can try an ice or cool pack to your feet before and after running, foot powder to help, a foot spray for
athletes foot. These things have been known to help. New
shoes and socks or these methods does often solve the problem for runners. One other note on shoes is that maybe your feet have grown a tiny bit and so your shoes still fit but are tight, all of them. Too tight shoes can cause this.
If that doesn't help, I would say that you need to see a doctor at this point.