Yes, this is interesting. I have never asked a doctor what this could be, mine also come and go. tall girl, when you writes that you have had it under my feet, I have to tell you that I also have something weird under my feet: now and then I get all red under my feet, it itches A LOT, and it burns, and my feet get swollen and red, it always starts under the foot sole, and then the red, burning and swelling goes over the foot and on the top of it, this lasts for some days, and then I get a big watery bubble and the skin peals off and I have to get rid of a lot of loose skin that is covering my entire foot sole. Is this similiar to your feet issues?
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