How does the fold of anus appear swollen to return a responsibility

Anal mouth fold, under normal circumstances is the surface layer without significant protrusion of soft skin, if the skin fold like swollen the same, as anal mouth swelling, pain, skin surface tone purple dark, considering the possibility of thrombotic external hemorrhoids caused, the root cause of external hemorrhoids subcutaneous bleeding produce blood clots. If the patient with anal swelling pain, body temperature rise, may also be produced perianal abscess, belonging to purulent around the anus, feeling Qi type of disease. If the anal folds without significant pain, consider is external hemorrhoids or mixed hemorrhoids caused, this and the patient long-term squatting stool, severe constipation, diarrhea related.