TT #248 · 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.
Torah Temimah cites Megillah 8b for including a metzora under quarantine in the rule requiring removal from the camp.
E-Daf — Megillah 8b · Sefaria — Megillah 8b, source text and translation
English: The Sifra derives that even a metzora under quarantine is included among those who must be sent outside the camp.
Textual derivation
A metzora under quarantine is also included in the rule requiring removal from the camp.