I'm 15. Swollen itchy fingers on one hand?

For a couple of days now I've been suffering from swelling of the fingers on one hand. First it started swelling on my index finger, with a couple of visible red dots under the skin, and then it started on my ring finger, but the swelling was different, it got swollen at one point beyond the big joint of the finger and another swelling at the smaller joint of the finger. This time the swelling was hard to the touch. Like two red dots.
And then my little finger started swelling too, but this one was different also. It was like normal swelling(not like the other two) but it was also partially centered near the joint.
It's itchy.
And also there are little cuts on the skin like it needs moisture.
I went to the doctor and she gave me some creme called Betrion, it didn't really help.
And it's getting worse. Now my whole fingers began swelling.

I've got some pictures.
Swollen ring finger: http://oi41.tinypic.com/24fgt1y.jpg
The whole hand: http://oi39.tinypic.com/15qqn37.jpg
And again: http://oi43.tinypic.com/2elfnk4.jpg
Index: http://oi39.tinypic.com/6e0xp5.jpg

I'm not showing a special picture of my little finger because there's nothing obvious on it.

[CoolCroatian]

Also I just noticed that my skin is cracking from dryness.

[CoolCroatian]

Help please. It's getting worse.