Okay I know this is very trivial and really not the end of the world, but I'm not sure If I need to see a nurse at my local GP.
Last night my finger started hurting, I just thought I'd cut it so didn't even look at it, but as the evening wore on it got more & more painful. A little purple blister came up on the joint above my knuckle. It started to swell up so I just went to bed hoping it would have gone by the morning. The blister is now double the size & is predominantly white, with some purple. I can't really straighten out my finger, and it really hurts!
Does it sound like an infection? I don't remember cutting my finger at all 
Is there anything I can do for it?