Our expert says:
Grommets are inserted to create ventilation of the middle ear cleft if conservative management (ie antibiotics) fail. Sometimes the problem of discharging ears occur, this may become problematic as in your sons case. The infection should be treated with topical antibiotic drops, after a pus swab has been taken to culture the causitive bacteria. This should be combined with cleaning of the ear canal (ear toilette) before the drops are instilled. If this fails, a multipurpose ointment such as Quadriderm could be used in the ear in order to combat the problem. The ear should be kept dry to prevent further problems.
It would also be helpful to see your paediatrician to exclude another systemic cause such as uncontrolled asthma or allergies, as this will prevent the ears from clearing.
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