To evaluate the hemostatic and analgesic effect of using gauze with Bosmin or Gelfoam after anal surgery.

Hemorrhoidectomy and fistulotomy these two types of anal surgery are common surgeries in colon and rectal surgery division in Shuang Ho hospital. For these patients underwent surgical treatment, some surgeons used gauze with Bosmin for hemostasis and analgesia after surgery, and other surgeons used Gelfoam. These choices were often determined by surgeon's personal preference according to their experiences. Shuang Ho hospital has top three quantity of hemorrhoidectomy in Taiwan. So, a randomized controlled trial is conducted to evaluate the difference between hemostatic agents use after anal surgery.

Inclusion Criteria:

• Patients who undergo conventional hemorrhoidectomy or stapled hemorrhonidpexy are include.
• Patients who undergo fistulectomy or fistulotomy are include.

Exclusion Criteria:

• Emergency operation
• Patients with colorectal cancer
• Liver cirrhosis
• Patients with coagulopathy
• Patients with HIV infection

The datasets used in this study can be obtained from the investigator upon reasonable request.

data is available as the study is complete and for 12 month period

will be shared upon request