Rather than a skin problem, this is likely to be a nerve problem.
The condition of an abnormal sensation in the head or scalp region is called 'Scalp Dysesthesia
The different types of abnormal sensations may be burning at the top of the head, itching, crawling, 'lightness', heat, cold, etc.
In your case you are having ithiness.
The exact pathology is not known, but it is theorised that it is probably due to some nerve disorder.
The drugs used for treating this is Doxepin or Amytriptiline.
You should consult with your doctor and discuss with him about scalp dysesthesia and also about treatment with doxepin or amytriptiline.
Other supportive measures that you can try at home are: Maintaining optimum weight, proper diet, vitamin supplements, exercise, treating stress and depression which will help in reducing the symptoms. You should try to achieve this at home. You should also take Vitamin B and Vitamin E supplements which are available at all pharmacies. You should also go for regular exercise
You can look up this study on this condition: http://archderm.ama-assn.org/cgi/content/full/134/3/327
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