IFNL1 and Ito hypomelanosis: In IPA patients, BALF IFN-λ1 and IFN-λ3 levels were significantly higher than in non-IPA patients (IFN-λ1: 284.60 [229.12, 357.99] pg/mL vs. 189.50 [140.00, 233.69] pg/mL, <i>P</i> < 0.0001; IFN-λ3: 189.70 [94.94, 271.79] pg/mL vs. 78.15 [36.54, 149.14] pg/mL, <i>P</i> < 0.0001).