Thank you for your interest in TCM and I am sorry to hear about your experience.
Firstly, there are various reasons which can cause skin rashes and itch. If it is due to something you wear, you might be suffering from contact dermatitis, which is an allergic reaction to certain materials or chemicals.
I will need a physical consultation with you( to assess your skin, collect medical history, pulse-taking etc) before I can advise you further. I have personally managed many chronic skin conditions such as eczema and urticaria which have yielded positive results.
Chronic itch (presented as dry, flaky and thickened) is usually attributed to Blood deficiency, which can be treated with herbal prescription with acupuncture.
I do hope you will feel better soon!