I hv been experieincing a tingling/prickling sensation at top of my head (just at the roots of hair). at times, like a dull pain. what could this be?

See dermatologist: There are several possible reasons for this. This could be due to skin causes such as dry skin, an infection of the scalp, vitamin b deficiency especially b12, or abnormal thyroid function . Occasionally, scalp tenderness and tingling are seen in patients who have chronic headaches such as migraine. The treatment is different for each cause. Check with your gp or dermatologist first.