After washing my pillow for the second time, small round black dots appeared in one section. I washed by hand in warm water and hung the pillow to drip dry per the instructions. I'm not sure if it's the beads or not. The pillow case, washed by machine in cold water also came out with a black mark on it that I have not been able to remove. Has anyone else had this problem? If so, how did you get the black off?