I HAVE A TINGLING AND PINS AND NEEDLES IN MY

I HAVE A TINGLING AND PINS AND NEEDLES IN MY RIGHT ARM WHICH GOE,S UP TO MY SHOULDER, SOMETIMES MY NECK HURTS WHEN I TURN MY HEAD,IT COMES ON MOSTLY WHEN I REST MY ARM ON MY KNEE, ALSO WHEN I AM ON THE COMPUTER, IT ALSO FEELS AS IF MY SKIN AS CRAWLING ON MY RIGHT ARM.