Dermatomyositis (DM) is a connective-tissue disease related to polymyositis (PM) that is characterized by inflammation of the muscles and the skin. While DM most frequently affects the skin and muscles, it is a systemic disorder that may also affect the joints, the esophagus, the lungs, and, less commonly, the heart. (from wikipedia)

image from emedicine

Lesions on the dorsal aspect of the hand, demonstrating the photodistribution of Dermatomyositis, are shown.  Note the sparing of the interdigital web spaces.

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