Differential diagnosis
The other common cause of a localised anal swelling is the perianal haematoma. This lesion is always covered by skin, which distinguishes it from the mucosa-covered prolapsed haemorrhoid.
Another cause of bright red blood passed per rectum associated with the passing of stools is an anal fissure.
Other differentials are:
- rectal prolapse
- anal polyp
- inflammatory bowel disease
- rectal carcinoma
- anal carcinoma
- genital warts
- threadworms (pruritis ani)
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