Due to constipation or straining too much, least supported area around anal opening gets torn , it’s called anal fissure, which is associated with pain and bleeding Given history of constipation, it is most probable to be the same.
however for definite diagnosis anal examination is required as hemorroids also presents like this.
Next Steps
High fiber diet, good hydration,
Include salad in all meals and fruits in between meals.
Take at least 2-3 lit of water daily.
Health Tips
Avoid constipation and straining .