External Hemorrhoid Tissue
Hemorrhoids (US English) or haemorrhoids (UK), are vascular structures in the anal canal which help with stool control. Hemorrhoidal tissue lies within the anal canal and perianal area. It consists of blood vessels, connective tissue, and a small amount of muscle. There are two main types of hemorrhoids: internal and external. External hemorrhoids are covered by skin that is very sensitive. When problems develop, these two types of hemorrhoids can have very different symptoms and treatments. External hemorrhoids may produce few symptoms or if thrombosed significant pain and swelling in the area of the anus. Many people incorrectly refer to any symptom occurring around the anal-rectal area as "hemorrhoids" and serious causes of the symptoms should be ruled out.