Thank you for your query.
The nose bleed comes from an area known as Little's area on the nasal septum
. As it is occuring frequently, the area must be raw and not healed properly. Ensure that a little vaseline or any bland ointment is applied on the area so that a soft scab forms and heals. Also ensure that your son's blood pressure is checked to rule out hypertension
I hope I have answered your query to your satisfaction.
Wishing your son an early recovery.