###Human: What is the small blister covering anus that makes it painful while passing stool? ###Assistant: Hi. I have seen the image (attachment removed to protect patient identity). This looks just like hemorrhoid typically that occurs with constipation and goes away on its own. The solution is to avoid constipation by drinking more than enough water and taking fiber-rich foods like raw leafy vegetables and green fruits. Also, avoid meats and non-vegetarian items currently as they aggravate this issue. You may continue the laxative that you are taking as well till your constipation is better but not more than two weeks. Take care and get well soon.