system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why doesn't a bleeding hemorrhoid get infected when its exposed to feces?
gpt
They can and sometimes do. But the lining of the intestines is very rich in lymphoid tissue. White blood cells can quickly access the area and contain the infection. Additionally, any infections arising from this area are likely to be not aggressive as we have lived with those bacteria our whole lives. In a manner of speaking, over time our gut essentially selects fauna that are 'good' and do stuff that helps our body like absorbs vitamins that we cant naturally do. At some level, the bad bacteria are outcompeted by the good ones. So the likelihood of an aggressive infection due to feces is less compared to a wound getting infected due to outside exposure.

EDIT: There are parasites and bacteria transmitted via feces, im sure these conditions would be aggravated by having hemorrhoids.