This is a good question regarding a common problem. Your son is not on any nose sprays so that cause can be ruled out. Often children with nose bleeds bleed from a specific spot in the membrane lining the inside of the nose called 'Little's area' This is where the blood vessels may be quite fragile and bleed easily. It would be best to ask an ENT specialist to see your son.As part of the examination your son should have a full blood count done to make sure that all his blood cells are normal.
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