TT #149 · Parshas Tazria · Aliyah 3 · Passuk 18
English: When the flesh has a boil on its skin and it heals.
Chabad.org — Chumash, English translation + Rashi for Vayikra 13:18
Sifra (Toras Kohanim).
Sifra — Vayikra 13, Midrash Sefer
English: Scripture says, “when there is in his skin,” to include even a boil that covers the whole area.
Textual derivation
The inclusive phrase covers a boil even when it occupies the entire relevant area and leaves no surrounding space.