it is tattooed on your head?

I was in a museum the other day and a fairly heavily tattooed man was opposite me.  He had a very intricate, colorful design on his head in the shape of a kippah, which conveniently also covered his bald spot.  The design was continued on his neck.

The following doesn’t do it justice (it is not intricate or colorful enough), but just to give you an idea of what was IN this guy’s head:

So, does ink count as a head covering?  Does the pain of tattooing one’s scalp tip the balance?

Or are we all just grossed out?