Avoiding feet tan, even with sunblock + socks

My feet are ugly because they're almost always 2 colors. I wear sketchers when I go for walks and thick socks but it still doesn't prevent my feet from tanning. I tried using Amlactin foot cream which worked but since there have been sunny days again it seems futile. I put spf on my feet and then my socks but I'm also considering wearing 2 socks because of this. Advice?