Effectiveness and Safety of Nexpowder as an Endoscopic Hemostatic Treatment

Inclusion Criteria: 1. Adult volunteers aged 19 or older during screening 2. A person who is scheduled to perform polypectomy for polyps with a diameter of 2 cm or more, such as Endoscopic Mucosal Resection (EMR) or Endoscopic Submucosal Dissection (ESD) 3. If the researcher agrees to voluntarily participate in the clinical study and determines that the subject cannot voluntarily consent due to the elderly aged 80 or older or other emergency situations, a written consent of the subject's legal representative is required Exclusion Criteria: 1. Upper gastrointestinal bleeding 2. If ulcerative bleeding is not caused by the procedure 3. If you are suffering from a blood clotting disorder 4. Aspirin and anticoagulant medications cannot be discontinued 5. Pregnant or lactating 6. Where colonoscopy is prohibited due to comorbid diseases, etc 7. If the bleeding area cannot be identified or the bleeding area cannot be reached with an endoscope 8. If you have participated in a relevant clinical trial that may affect the results of this study within the last one month 9. Those with genetic problems such as galactose intolerance, Lapp lactase deficiency, or glucose galactose malabsorption 10. A person who is hypersensitive to food additive Blue No. 1 or has a history of allergies 11. In the case where the researcher determines that it is inappropriate to participate in clinical trials due to other reasons other than the above selection exclusion criteria