I don't have an answer, but as someone blessed with high ear wax production, I typically keep prepacked alcohol wipes on hand for IEM listening session and give them a wipe down every time, no matter what. Might be worth considering if you think it could be what is causing the issue.
Answer: Could be. It couldn't hurt to disinfect tips/shells before/after use.
Depending on the infection, consider also the sinuses. You, yes you, have a sinus behind your ears.
IEMs make your ears sweat and summer helps dry up the sweat. Winter months don’t and the sweat build up is a breeding place for bacteria, and overtime results in a bacterial infection.
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