IFIH1 and interstitial lung disease: Based on the characteristic cutaneous findings without obvious muscle symptoms, the presence of anti-MDA5 antibodies, and HRCT evidence of ILD, the patient was diagnosed with anti-MDA5 antibody-positive CADM complicated by RP-ILD[(Kurtzman and Vleugels, 2018; Gerami et al., 2006; Stonecipher et al., 1993)].