Lots of things.: There are a number of possible causes of itching;it's a good idea to see your doctor to determine the specific cause and any treatment needed.
Answered 10/4/2016
6.1k views
Dermatographism.: Your description is consistent with dermatogrpahism (literally, writing on the skin). The pressure of scratching triggers release of histamine. This is the chemical responsible for hives and a number of allergy symptoms. Usually, there is no external cause but an investigation with your doctor is worthwhile.
Answered 4/15/2017
6.1k views
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