IHAVE HAD INTERMITTENT TINGING DOWN THE INSIDE OF MY LEFT

IHAVE HAD INTERMITTENT TINGING DOWN THE INSIDE OF MY LEFT ARM FROM MY SHOLDER TO HAND WITH INTENSE ITCHING ALONG A SPECIFIC TRACT TO MY THUMB AND POINTER FINGER. I COLD RIP THE SKIN OFF IT IS SO ITCHY AT TIMES. THIS AD WORSENED OVER THE PAST 6 MONTHS. YOUR THOUGHTS. I NEVER HAD CHICKEN PAX AND WAS VACCINATED FOR CHICKEN POX ABOUT 20 YEARS AGO.