Does anyone know why certain spots on your body would be more prone to getting scar tissue then others? For years i stayed away from pinning my shoulders because i always had some occasional pain when lifting and didnt want to make it aggravate it. Recently , in the last year i started shooting there and now when i pin, i can actually hear a crunching in certain spots when trying to push the pin in. Other spots like quad and glutes i never seem to have a problem. Should you stay away from spots that seem to have this scar tissue build up?