After anal thrombosis surgery, I have a thread hanging out of my anus. What should I do?

Good morning, I had inpatient surgery for anal thrombosis over two weeks ago. The pain has finally been virtually gone for three days. Yesterday, after my bowel movement, when my "nurse" (friend) tried to insert a new compress into the crack, she noticed that a thread about 2 to 3 cm long was hanging out…