TT #251 · Parshas Tazria · Aliyah 7 · Passuk 46
English: All the days that the affliction is upon him he shall be impure; he is impure. He shall dwell alone; his dwelling shall be outside the camp.
Chabad.org — Chumash, English translation + Rashi for Vayikra 13:46
Torah Temimah cites Sifra (Toras Kohanim) for extending the isolation requirement to the other categories of people afflicted with tzaraas.
Sifra — Vayikra 13, Midrash Sefer
English: I know this case alone; how do we include other people afflicted with tzaraas? The verse teaches that they too must dwell alone.
Textual derivation
The requirement of isolation extends beyond the specific case named in the preceding teaching to other categories of people afflicted with tzaraas.