Pain and burning with bowel movements that started during your period can come from a small anal fissure, irritated haemorrhoids, or skin irritation from pads rubbing the area. It is rarely something serious at your age.
Next Steps
Keep the area clean and dry, use a mild barrier cream, and avoid straining. If it does not settle in a week or keeps worsening, please visit a gynaecologist or physician in person to check for a fissure or infection.
Health Tips
See a doctor sooner if you notice bleeding, a lump, fever, or pain spreading to your lower abdomen.