How To Cure Itchiness And Dryness In Skin?

Hi, may I answer your health queries right now ? Please type query here...my girlfriend has itchy scaly skin. It has started on her hand and has spread to her arm ad well. She has it no some on her legs and her neck. She says she has been tithe docs couple years ago and they didn't know what it was. She says that it goes away when she tans. Do you know anything that can help or what she may have?