That looks extremely worrying @ckoei, blue is not a good colour for feet!
Before I had my heart attack I had considerable oedema in my ankles and lower legs, so bad in fact that I couldn’t get normal shoes on. I have used ‘soft top’ socks, but I found that they didn’t stay up and ended up bunched around my ankle inducing a similar tourniquet effect. In the end, I abandoned socks altogether in favour of wearing Crocs sandals. Even with severe neuropathy I find them wonderfully comfortable, and as they should be worn oversize anyway, they can accommodate a certain amount of swelling. I now rarely wear socks, just occasionally in the deepest darkest winter. Luckily my circulation is still good even if the nerves are shot.
Since I had the stents fitted in the artery in my heart, the oedema has reduced considerably and only becomes noticeable after long periods parked on my more than ample posterior.