gloves and grips should correct this. there's a nerve at the base of your pinky finger on your palm that tends to get pinched while riding. if too much pressure is placed on it for too long, you're going to get numbness in the wrists and sometimes up the arms. drop some cash on a good pair of gloves with a pad in that area (as well as the base of your thumb on your palm) and your numbness should subside.