He looks cool from the front, but he looks like he's wearing a joke wig from the back.
What can he do?

If he went that little bit further up Helens posterior, that could solve it. The only problem being there cant be much room since Ashleigh went up a while back.

Maybe he should add another joke wig to cover it up

Go to a proper a hairdresser and never let Helen near him with the clippers again.

Shave the lot off

Celebrate it

I think it's a double crown rather than a bald spot

this

Or he could do a Yul Brinner and wear a cowboy hat.

Yeah, or maybe he could wear Mark's eyebrows as a weave.

Aww bless him, nothing wrong with it he just needs a proper haircut.

Draw on a smiley face,maybe or what about

Paint a target on it so Mark knows where to aim his barbs

It's not a bald spot. He had an illness or injury when he was a baby and it resulted in a double crown.

He should wait for about 25 years until the natural MPB process allows the rest of his scalp to catch up.