I have had a tingling sensation in my head for about 12 months , what could this be?

Tingling: In order to get an adequate diagnosis you need to check with your physician. He will obtain an adequate history and perform an exam and determine if you need testing to establish a diagnosis and treatment. Possibilities are too numerous and not limited to the : normal (no disease), allergies, allodynia in migraines, diabetes, vitamin B12 deficiency, skin conditions.