Skins Bug

When I changed my skins to a different one and then I joined my own server, and it doesn't show the skins, I joined one of the featured servers in Minecraft, the skins still didn't show, I restarted my PC and while my PC was restarting I opened Minecraft on my phone and joined a featured server and it still didn't show my skins that I changed, please fix this, this is very important.