A new discovery in the Charlie-verse

I thought we'd seen it all, but no. Today Charlie sports a radiating wrinkle, and like the plinkles and other phenomena that occur on his clothes, I have no idea how this comes about. Below is a sketch of the wrinkle (C wouldn't let me take a pic). 3 sharp lines (and a 4th faint one) meet perfectly at a single center point.

You just explain to me how this wrinkle could occur naturally.