Thank you for the question. Your son has got Cerumen (Wax) accumulation in his external ear canal
which is asymptomatic. Mineral oil acts as a ceruminolytic agent which will help to clear of cerumen by making it soft. Asymptomatic cerumen accumulation usually doesn't need any treatment. If your child have any problem like ear pain
or itchiness, ear fullness, hearing loss
etc, then you may consult with a specialist.