My itchy skin turned out to be eczema. I agree with payson on the treatment. If it is something like that and can be controlled with lotions, etc, then no visit to the dermatologist would be called for.
If it is eczema, repeated scratching will raise red scabby bumps on the skin over time. To avoid this, I use something like the Johnson’s gel or any moisturizing (unscented) lotion.
Kirsten