I believe that it could definately be related to the UCTD but I'm sure there are other possible causes as well. From my understanding UCTD is a diagnosis given often when there is a suspecion of an autoimmune disease but there are not yet enough symptoms present to make a definitive diagnosis. I would let your doctor know about this new symptom especially if it continues and they will have more knowledge about what it might mean in relation to your diagnosis. For the pain I would definately take any anti-inflammatory medication you have been prescribed or any over the counter medications your doctor has given you the OK to take when you have pain. By the way, is there any color change that happens with your fingers when you have the cool/tingling feeling?