0.9 cm colon polyps half a month to check again when there is no more, the possibility of detection error is very large, but also does not rule out the relationship between the disappearance of their own. 1. Detection error: this is the biggest possibility, if the patient goes to a less formal hospital examination, may be due to the examination of the physician’s level of medical skill is not enough, or equipment abnormalities and other circumstances, resulting in detection errors, so in the second time to do the examination will find that the polyp has disappeared. 2. Disappear on their own: If the patient’s colon polyp is a juvenile polyp or congenital colon polyp, usually belongs to the faulty tumor-like polyp, 0.9 cm polyp to puberty, a part of the patient will subside on their own. It is best to go to a better hospital for another examination, and the final diagnosis should be based on the second examination.