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When a patient has external hemorrhoids, they will lie under the skin around the anus. They can become very itchy and may bleed. Sometimes, the blood may accumulate and form a thrombus (clot), which can be painful; the area will swell and become inflamed. External hemorrhoids are more likely to present with pain.
When irritated, external hemorrhoids can itch or bleed. Sometimes blood may pool in an external hemorrhoid and form a clot (thrombus), resulting in severe pain, swelling and inflammation. When to see a doctor. Bleeding during bowel movements is the most common sign of hemorrhoids.But rectal bleeding can occur with other diseases, including colorectal cancer and anal cancer.Don't assume that bleeding is coming from hemorrhoids without consulting a doctor.hen irritated, external hemorrhoids can itch or bleed. Sometimes blood may pool in an external hemorrhoid and form a clot (thrombus), resulting in severe pain, swelling and inflammation. When to see a doctor. Bleeding during bowel movements is the most common sign of hemorrhoids.