Localized scleroderma secondary to mixed connective tissue disease during abatacept therapy

A 47‐year‐old woman with mixed connective tissue disease was treated abatacept. After 2 months, a 3‐cm depression atrophied surface observed on her back, which had histopathological consistent the symptoms of localized scleroderma. Although some cases paradoxical reaction or cutaneous adverse event have been reported from abatacept, no scleroderma has reported, suggesting this to be unique case.