I Have Had A Swollen Pinkie Knuckle Since Yesterday. And

I have had a swollen pinkie knuckle since yesterday. And it hurts when I use it, and when it is straight. I have been knitting for a couple of days, and my parents think that is why it is swollen and sore. And it is also bruised, and the knuckle is swollen. It hurts really bad when I try to lift it higher or straighter than my other fingers. And I have been icing it since this morning. And the swelling has not gone down