The lesions themselves are typically clusters of small, painful, fluid-filled blisters, that ooze and ulcerate, and then eventually heal after a few weeks.

病变通常表现为一簇小的、疼痛的、充满液体的水疱，造成渗出和溃疡，能够在几周后痊愈。

However, in some cases, a polyp can ulcerate causing rectal bleeding, and sometimes that bleeding can be very subtle and go unnoticed, but can result in anemia over time.

然而，在某些情况下，息肉形成溃疡，引起直肠出血，有时出血轻微，不易被发现，但久而久之可能发展为贫血。