>>8754005You do understand how closeup this pic is taken, right? Talking about lumps on that Saitama, ya, agreed. On here? That's hardly fair. And zoom up to anything enough and you'll find flaws.
The wash is also meant to go over the teeth. Probably pooled a bit extra on that copy, but it's always present. But if you're going to say why does he have black stuff in his teeth, you must as well ask why he has black stuff around his eyes.