I have gone through your query.
It suggests that your friend may be suffering from the otitis externa
Excessive moisture and trauma(self cleaning of the ear canal
by ear bud, key etc), both of which impair the canal's natural defenses, are the two most common precipitants of otitis externa, and avoidance of these precipitants is the cornerstone of prevention.
But for exclusion of the other disease, cleaning of the external auditory canal, please consult the ENT specialist
If you have any doubt, I will be available for your query.