Slightly abnormal cells are found on the surface of the cervix. CIN 1 is usually caused by certain types of human papillomavirus (HPV) and is found when a cervical biopsy is done. CIN 1 is not cancer and usually goes away on its own without treatment. Sometimes it becomes cancer and spreads to nearby normal tissue. CIN 1 is sometimes called low-grade or mild dysplasia. Also called cervical squamous intraepithelial neoplasia 1.