Hello everyone! My son has redness in his anus after going to the toil…

Hello everyone! My son has redness in his anus after going to the toilet. It passes throughout the day. He goes to the toilet daily, there's no constipation, the consistency is not firm, and he doesn't cry during bowel movements. I read that it could be lactose intolerance, but it can also be normal. When holding him for 5 minutes, his skin becomes red. Has anyone experienced this?