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The purpose of this study is to measure the long-term safety and tolerability of efgartigimod PH20 SC in adult participants with idiopathic inflammatory myopathy (IIM) who previously participated in ARGX-113-2007. Participants will receive fixed weekly injections of efgartigimod PH20 SC 1000 mg during the treatment period. During the treatment period, visits are every 12 weeks.