I Get Irritable Feelings In The Middle Of My Fingers

I get irritable feelings in the middle of my fingers under the nails that makes me want to bite them. So it's not the edges of my nails that are a bother, it's a feeling I get under the nail and I want to bite the to get to the core of the feeling. Sometimes I feel like I want to dig something sharp through the sensation in order to kill the 'nerve' that sends the irritating feeling. Suggestions.