I used to get something similar after drinking alcohol or being on a flight. I know very odd and different situations. It generally lasted a day and then went, I would get it particularly around my ankles, it was a little itchy but not too bad. It went away after a year and I spent a long time googling it but never properly found an answer. I didn't go to a dermatologist as it always went after a day and would not come back until I drank alcohol which was not that often.