My son has small bubble like blisters near his eyes closer to the nose for over 20 days they are increasing now. Is there any home treatment for it? Or any other herbal treatment for it?

Take him to a doctor. Don't assume that people online are going to be able to diagnose your child correctly, and give you a magic remedy. I'm sorry if that sounds harsh, but you need to take your child to the doctor if you think something is wrong.