Whether a metzora communicates impurity inside a rooved structure, if he is moving through, or where the item which would become impure is moving through: Berachot 25a; Kiddushin 33b
Whether a quarantined metzora communicates impurity as a full metzora does: Megillah 8b
Whether a full metzora communicates impurity retroactive to his period of his quarantine: Megillah 8b