Consistent with previous reports, our study confirms that the incidence of arthritis, skin ulcer, Gottron's signs, and RP‐ILD was markedly higher in dermatomyositis patients with anti‐MDA5 Ab, whereas mechanic hand, heliotrope rash, V sign, and shawl sign did not differ between the two groups. Here, IFIH1 is linked to arthritic joint disease.