Fissures
A fissure is - get ready for the cringe-factor - a tear in the skin of the anus. It may be caused by inflammation of the area from frequent bowel movements or continued wiping.
Since the area of the body in which fissures can occur is frequently exposed to high levels of bacteria and germs - and even more so in patients living with Crohns disease - they can take longer to heal than the average cut or abrasion.
Treatment usually involves a topical medication and the recommendation that you use caution and act gently upon the affected area to avoid infection. They may last for a long time, but can usually be healed by taking the proper precautions.