I have been having slight burning sensation on the palms of my hands for a couple of years and recently when I touch something warm or hot the sensation is more amplified.

Not just touching hot, even i am normal and do nothing this icthing is there 24/7, i feel like icthing which is irrestibale, it becomes an horrible expericence for me, specailly when i nights without knowlingly i start to scrach.
After icthing and scraching my hand plam becomes red and if i expanding my hand my hands get swollen.

Don't know why this. Any ideas what this might be?