I am having black mites internally in my body, especially in my rectum. seemingly it is getting worse, after having a bowel movement there are numerous black specks on the toilet tissue. I am 72 years old, where in the world did they come from and how do I get rid of the itching. The also come on my body in the form of a redpimple in the middle of the bump there is a black speck,when I scratch it off, it bleeds. What do you think Doc?