Our expert says:
I must be honest that I don't know too much about this topic - it's not my area of interest, it's a podiatry question, not an exercise one.
I found the following definition for it though:
A localized area of skin that is has its sensation via a single nerve from a single nerve root of the spinal cord.
So, I gather a nerve can become irritated and this can affect an area of skin on the foot.
But again, this is a podiatry or even medical question, I'd suggest that's who you need to see about it.
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