I got one mystic skin but after I was looking at my clan said i'm LEADER?

I'm assuming the leader left the clan,which automatically put you in charge of you were co-leader. It had nothing to do with the mystic skin

Lucky! You got a mystic skin and became a leader at the same time! You’re probably leader, because the previous clan leader wanted a new clan, or wanted to be a lone wolf or, watever your leader was, but he/she didn’t wanted the clan to disappear forever, so he/she had to choose a new leader, and he/she chose YOU. But, you’re one of the luckyest person I’ve ever new :-)