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This sounds familiar to a condition that I had a few years a go. In my case it was an allergic reaction to hair gel.   To relieve the itching temporarily I used allergy medicines, for me Benadryl didn't work well so I turned to Zyrtec, they both make you a little drowsy so I recommend that you don't drive or do anything with machinery until you believe that you can control your drowsiness.   If its an allergic reaction to something then you can test out your environment and the items that you use, eat and encounter in your daily life in an effort to eliminate them. It took me 3 months before I figured out that it was hair gel that was causing my allergies.   Also I had an allergy test as well and the doctors still couldn't figure out what I was allergic to its most likely due to the possibility that hair gel wasn't on their list of things to test me for.   Hope this helps.