Commentary for Avodah Zarah 55:7
אלמא כמכה של חלל דמיא אמר רב נחמן בר יצחק שאני צפדינא הואיל ומתחיל בפה וגומר בבני מעיים
Now is it not evident then that [a sore on the gum] is regarded as an internal sore? R. Nahman b. Yitzchak said: Scurvy is different, because though starting in the mouth it extends to the intestines.
Daf Shevui to Avodah Zarah
Scurvy is worse than regular sores on the gums because it can spread into one’s body. So one can cure scurvy, but we’re still not sure about regular sores.
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