hello and welcome to HCM,
First of all let me mention that nose bleed is very common in kids in this age group and in most of the cases you have nothing to worry about. However it is always advisable to undergo a complete assessment to be on the safe side:
1. Get an ENT to do a complete examination including an
endoscopy if possible and also CT of the nose to get a complete and better picture
2. Perform a complete blood testing including a coagulation profile so that the causes due to the problems in the blood can be ruled out
3. Make sure that he never picks on his nose and make sure his nails are always well kept and never sharp as the skin of the nose is very very delicate and even a small trauma can cause severe bleeding
4. Make sure he never sleeps in the direct blast of the AC or the fan
5. Impress upon the ENT to know the condition of his tonsils and
adenoids which are the common causes of nose bleed in this age group
6. He may need to be started on treatment of reflux for proper control of his
cough.
7. Since you have rightly opined about his surroundings, they are very important and need to be as clean as possible. Although the mold usually causes
allergy and frequent infection which may or may not cause nose bleed but it pays to be safe
take care and try steam inhalation once in a while
Dr Sriram Nathan