Andrea, outer edge of the arm, esp. from the elbow down and including the pinkie and outer edge of the ring finger may indicate an upset ulnar nerve. I had that, went through all kinds of tests at an occupational medicine center. They told me my ulnar nerves, in both arms, were very close to the surface and to wear protective elbow pads. They also told me I must've been bumping my elbow a lot to aggravate the nerve. I was certain I wasn't, but after I started wearing the pads and watching out, I found I was bumping them a lot, on the edge of the car door while driving, going through doorways in a hurry, etc. The pads really helped; most of the pain went away.