Focal hyperkeratosis overlying the palmar faces of interphalangeal and metacarpophalangeal joints revealing a juvenile dermatomyositis

Abstract

Dermatomyositis (DM) is an idiopathic inflammatory myopathy characterized by an inflammatory infiltrate primarily affecting the skeletal muscle and skin [1]. It is the commonest of the idiopathic inflammatory myopathies of childhood, comprising 85% of cases. It has an annual incidence estimated to range between 1.9 and 4.1 per million children [2, 3].

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