Change either your washing powder or woolly socks, both of them irritated my feet in the past, I am allergic to wool, which causes a rash which looks like athletes foot.
When we changed washing powder last year it seem to be fine until about December when the itching began.
After trying for months all sorts of medication for athletes foot, witch hazel, tea tree cream, salt, vinegar, Bicarb Soda, etc. etc., nothing got rid of the itch other then a short relieve for a few hours perhaps for one day at the max.
We changed powder back to the previous brand and within 48 hours the itch was gone. Hope that it may alleviate someone's misery as it did mine.
Just wash feet and use socks that contain no wool and/or change your washing powder, good luck!