신명기 28:27 해설: Rashi, Chizkuni, Ibn Ezra & Rabbeinu Bahya

בשחין מצרים [THE LORD WILL SMITH THEE] WITH THE BOILS OF EGYPT — This was very bad, being wet inside and dry on the surface, as is stated in Treatise Bechorot 41a.

ובטחורים, and incurable hemorrhoids. Seeing that these ailments originate in hidden regions of the body they cannot be treated medically, and are described in the written text as עפולין, “from a dark place.”

Those people who survive will then be struck with Egyptian boils.

גרב is a wet boil,

חרס is a boil dry as a potsherd (חרס identical with חרש, a potsherd cf. Rashi on Leviticus 21:20).