How to treat infant ear canal inflammation

Patient's question:

My daughter just turned one month old and frequently spits up milk. Recently, I noticed that her left earlobe and the outer part of her ear canal were red, with thick yellow fluid leaking out. After the doctor examined her, they said it was an ear canal infection and recommended using erythromycin ointment for topical application. I would like to ask:
1. Is it okay to use this medication this way?
2. What could be the cause of this? What should I pay attention to in daily life?
3. Will it affect her hearing in the future? I would be grateful if the doctor could take a moment to answer my questions.

Doctor's answer:

Hello: What you mentioned belongs to otitis media! Improving middle ear ventilation
  1. Apply 1.1% ephedrine solution or furacilin ephedrine solution, or chloramphenicol ephedrine solution to the nose.
  2. Eustachian tube ventilation: Methods such as the nose pinch method, swallowing ventilation method, or catheter inflation method can be used. Avoid using these methods if there is concurrent acute upper respiratory tract infection.
  3. Infrared or ultrashort wave heat therapy to improve blood circulation in the middle ear and promote the subsidence of mucosal edema.

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