Pain in my middle finger?

I have a lot of pain in my middle finger on my right hand when I touch/hold things. This is a big issue because I am a pitcher for my high school baseball team. The pain is on the left side of the nail, but not the nail itself. I don't ever remember getting a splinter or cutting the finger or smashing it or anything of that nature. The pain went away for awhile but then came back recently...any idea on what this might be? Any advice would be really helpful...thanks in advance!