<unk>  are caused by the rupture of a small vein that drains blood from the anus. This rupture may be the result of forceful or strained bowel movement, anal sex or caused by heavy lifting, coughing or straining. Once the rupture has formed, blood quickly pools within a few hours and, if left untreated, forms a clot.
Perianal hematoma
Anal fissure
Anal fistula
Perianal cellulitis
Anal wink
Rectal discharge
Rectal tenesmus
Perineal hernia