TT #252 · 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 Pesachim 67a for the rule that the metzora must be separated even from other impure people.
English: “He shall dwell alone” means that other impure people must not sit with him.
Textual derivation
The metzora must be isolated even from other people who are themselves ritually impure.