A child has a lump behind one ear, what's the matter?

Patient's question:

Sure, here is the translation of the content you provided:
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No
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Doctor's answer:

Hello, if your child's condition is accompanied by pain, it may be lymph node enlargement. This situation is usually caused by infection. Since your child has a relatively developed immune system, lymph node enlargement is common. Generally, it will improve once the local inflammation subsides.

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