My skin itches on my I scratch like crazy and then come out in purple blood spots I have woken in the morning with about a 5 x 6cm mark on my arm and nit even known that I had been itching.?

Need to see a doctor. If the itching is just from sensitive skin or dry skin, such as eczema, many people find help with an OTC moisturizer such as CeraVe, Cetaphil, or Eucerin. Adding Hydrocortisone cream for 1 week helps some people. Some people find that Claritin or Zyrtec can help too. The itching may also be due to an internal disorder, such as liver problems or intestinal parasites, so one should see her doctor.