Hello,
There can be many causes for itchy skin. Please elaborate more on the symptoms and description of rashes if any so that a list of differentials can be made. Till that time, you can apply calamine lotion which helps in soothing the skin and wear cotton clothing.
I hope it helps. Take care and God bless.
More information might help. Is there a rash, welts, pocks? What have you done? have you changed detergents, diet? Do you have dry skin? Do you really have dry skin all over, meaning everywhere?
The first thing that comes to mind is stress. Stress and anxiety can play a huge part of skin problems. Do you have allergies? They can cause you to itch. Did you come in contact with something, someone?
There are so many possibilities that it's impossible to answer such a general question.