Pinky finger goes from itching to numb?

yesterday morning I woke up, and my pinky finger was itching so badly it hurt. It hurt to touch it. I put some ice on it, and it seemed to get better until later that day when it went kind of numb and was really red and tight. Again that night it was itching really bad but went away some before I went to bed. This morning it was itching so badly and hurting that it woke me up a few times. I ended up grabbing a cold can of sprite and just holding it and went back to sleep. All day today it has been going between numb and painful itching. I could not find bites or splinters or anything off other than the fact that it was red. what could be going on to cause it, and what can I do to stop it?