A Riddle

There's something at the bottom of my lip. It's on my chin. I keep touching it. It feels rough. I scratch it. It is still rough. It's irritating me. I want my chin smooth! So what's that doing there? Maybe i can scratch it off. Would it bleed? I don't want it to bleed. But it's still there and it's bugging me. But i should just leave it there. It'll go away.

So, have you guessed what's on my chin?