Is there a parasite that can go undetected,by burrowing under the skin,around the rectum area.Possibly disguised as a hemoroid.?I know I have some kind of a parasite in my body!I have sent so many stool samples off,only to come back negative.No one believes me.I also believe my dog has this parasite.Constipation,unusal rapid weight gain,occasional dizziness.I also think there is a possibilitgy of this parasite burrowing into areas,such as your finger and toe joints.Looks like a caterpillar.Worst symptom is eye pain.I have seen,with a magnifying glass and I have found some very unusal microscopic insects.