Haemorrhoids in the skin just outside the anus.
External hemorrhoids refer to enlarged veins that develop around the exterior of the anus, a condition often referred to as piles. Sometimes, they can be associated with internal hemorrhoids that form further up within the anal canal. If blood in an external hemorrhoid clots, the resultant swelling is called a perianal hematoma. This condition can be extremely painful, but it generally resolves itself within approximately five days.