Muscle & nerve
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A young woman presented with facial myokymia in association with dermatomyositis. There was no evidence of peripheral neuropathy. ⋯ Myokymia and dermatomyositis both responded to immunosuppressive treatment. The presence of antibodies to voltage-gated potassium channels and the association with dermatomyositis indicated an autoimmune cause for myokymia, which may have been due to reversible peripheral nerve hyperexcitability.