A 24-year-old woman was presented in whom thrombocytopenic purpura appeared during antiinflammatory drugs therapy for arthralgia. At that time she had a positive LE cell preparation, positive antinuclear factor and false positive serum test for syphilis. Steroid hormon and ACTH therapy were started under the diagnosis of systemic lupus erythematosus. In the 23-rd hospital days, she had a negative LE cell preparation, negative antinuclear factor and negative serum test for syphilis. In the 28-th days after stopping steroid hormon and ACTH therapy, positive LE cell preparation and positive antinuclear factor appeared again.