skin isnt working

my minecraft skin was being buggy earlier today and it had slim alex arms yesterday and when i went back on minecraft it had black lines on it so it went to steve. then i decided to go change my skin to something else and chose slim on the launcher and then booted up minecraft but then it was still my old skin with the steve arms and i even tried uninstalling minecraft and then reinstalling it but that didnt fix it and i also decided to log out and log back into my minecraft account but that also didnt work so i dont know what to do.