I woke up this morning with a wired iodine colored blotch on my hand. I've tried washing it over and over. It won't remove. My routine before bed has not changed. Likewise, there is nothing I touched that would have stained my hand. The blotches are on both hands. Though predominantly on my right. With splatters on my left fingeres. It doesn't itch or burn. Not it it rough to touch. Ideas as to what may have caused it ?