One of common mistakes and misconceptions is that there are ‘internal’ and ‘external’ hemorrhoids. Namely, ‘external’ hemorrhoids are, actually, perianal thrombosis.
It is formed as a consequence of blood clotting in nodes, sinuses of the external hemorrhoidal ring.
It is characterized by acute, sudden pain in the anal area. On the examination, it palpates as a firm, painful tumefact.
Treatment is simple, quick and efficient.