Dysplasia is a term for abnormal changes to cells. Warts are one kind of dysplasia. They are considered a low grade form of dysplasia.
Warts are usually caused by HPV 6 and HPV 11 and are generally non oncogenic. Although warts rarely progress into cancer, they can sometimes bleed or itch. Anal warts can be found just outside the opening to the anus or inside the anal canal. Some warts go away on their own, and some need treatment by a physician in order to get rid of them. There is no way to tell by appearance or by diagnostics which type will resolve on their own and which need to be removed. If left untreated some warts will stay the same, some will grow in size, and some may spread to other areas of the anogenital tract.