Under my fingernail was red, blue and white. I think i hit it off something but i removed a layer of nail?

I removed a layer of nail and i clean it out. But now there seems to be a hole, im hoping it grows back. Was it a bad move to destroy my fingernail's layer to clean out the blood.? :S What should i do to keep it from being infected?Under my fingernail was red, blue and white. I think i hit it off something but i removed a layer of nail?
it would have gone away after a while, and if not, then you might need to see a doctor