The downside of shaving one's head is that you run a risk of nicking yourself with the razor blade. This risk is no different than what most men encounter when they're shaving, say, their face.
The difference is that scalp nicks bleed a lot more. Or I can't get my blood to coagulate up there. Something is different, anyway, and I'm getting tired of holding this wad of tissue paper to the side of my head. Maybe, going forward, I'll just start sticking my head in a bucket of Nair.
Where the green grass grows