That location has lymph nodes, odor producing glands and sweat glands, all of which could be invaded by germs. Germ invasion can produce a swollen lump/cyst. Moist heat may increase blood flow enough that your natural healing factors could help, but sometimes these need antibiotics or even surgical drainage before they are cured.
Answered 4/15/2023
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Please let your parents know so that you can see your pediatrician for an exam and proper treatment.
Answered 4/12/2023
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