Puck has hair on his head!

[Tawmis]

I can't remember his baldness ever being explained; so maybe he does just shave his head.
Or am I forgetting something?
Or maybe it was mentioned in Uncanny X-Force, after I gave up on it?

I'd always assumed he was naturally bald - when he let Razzer (or whatever) go - did he have hair? I am pretty sure (if I remember) aside from getting old, he also suddenly grew a grey goatee - but can't recall if he had hair on his head too.