My skin went back to the default Alex skin even when I had a skin set and it was the default Steve skin type.

[18:20:37] [pool-2-thread-1/WARN]: Couldn't look up profile properties for com.mojang.authlib.GameProfile@67556d35[id=6df8e4dd-dfad-4bad-aec0-697f7cb78c54,name=Soarnrobertson,properties={},legacy=false]
com.mojang.authlib.exceptions.AuthenticationUnavailableException: Cannot contact authentication server

Most probably a glitch of the auth servers. Not a bug.

Thaks Kumasasa