Yeah it hurt and it was over quickly. I didn't get knocked out but it took a little while to gather my wits and figure out how to get up
I should note that the injury was a result of the nose protector on my goggles. The protector didn't line up with the helmet so well so the goggles were position a little oddly. When I face plated the chin bar pushed the goggles into my cheek bone which in turn tore the skin. I had 3 or 4 scallop shaped scars on my cheek for quite a while.