Hello Doctor, I have query for my 4 years old son who is off late troubled with blocked nose and yellow mucus, we live in Dubai where dust in the air is too much esp at this time since summer is just turning up. We trained him to blow his nose and he does it quite well now so that we can help him getting the mucus but I am worried that he is practising it blowing nose too hard and too often, I am beginning to worry that blowing nose so hard that too at his very young age will have some adverse effects. Is blowing nose to take the excess mucus good way in the kids and what is the best practise to blow nose?