Similarly to the adult form, the specific cutaneous phenotype found in anti-MDA5 DM, i.e. the palmar papules and skin ulcerations, are also observed in anti-MDA5 JDM, as well as arthritis, which is more frequent than in other subtypes of JDM (58, 59, 61, 64). The gene discussed is IFIH1; the disease is arthritic joint disease.