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Thanks for your question.
Does she have any sore throat or fever?
Swelling under the chin can be either a swollen lymph node or a salivary gland.
Inflammation from viral infection is the most common cause.
Bacterial infection causes more symptoms like fever, pain etc.
Less commonly, this can be a tumor under the chin.
Now in most cases the tumor is benign especially the one that appears suddenly.
Since there is no other symptoms, she can wait for the clinical evaluation after the easter weekend.
However, if fever or pain appears, then it is better to go to the local hospital for earlier evaluation and antibiotic course.
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