Replying to Nitric Acid has left its mark on me

We've been doing a lab in my AP chem class this week involving nitric acid. I spilled some on my hands a couple of times, hardly noticing it. At the most it felt like a little tingle, and I just flushed it with water and didn't worry about it. Now, I have all of this grey marks on my hands. Some are just specks, while others are patches. I can't wash it off, it's literally in my skin. I can cut some away and it's gone then, so it's not any lower than my epidermis. How fucked up is that though? I'm positive it's from the nitric acid. I wonder if it soaked into my bloodstream...own3d. I'll post pics if anyone wants me to.