I get this sometimes too.. I have restless leg syndrome and I always assumed it was that.. I usually make sure I do some toe touches/leg stretches when that happens, and it seems to go away. But I would like to know if anyone else knows what this is (as I'm definitely NOT a doctor lol)
Cotton socks only for now. No detergents. Little antihistamine might also help. I know how annoying this kind of thing can be.
I had that once sounds like Athlete's Foot all you need is some cream from the chemist that should sort it out. I've also found using a bit of talc on my feet after a shower is good, make sure it's not scented something like baby powder will do it.
I have had itches that return, it could be maybe you had a bite from an insect and it just flares up at times, I think that is what mine are from.