Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns...
As per your complain it seems that your son has suffered from a traumatic injury
leading to ear drum perforation and in case if the perforation is small it generally heals with medications..
But you should consult an Otolaryngologist and get evaluated and a thorough clinical evaluation and investigations like otoscopy will be done for confirmation..
He can be advised a course of antibiotics, anti inflammatory painkiller and decongestant nasal drops for faster resolution of the perforation..
In case if the perforation does not shows signs of healing in 2 to 3 weeks then surgical repair of the eardrum
can be done by Tympanoplasty
You should also avoid excessive water exposure to the ears..
Limit excessive exposure to loud sounds..
Hope this information helps..
Thanks and regards..
Dr.Honey Nandwani Arora..