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Synovial sarcoma is a type of malignancy which usually occurs near the joints of the arm, neck, or leg. It is a sarcoma of soft tissue and accounts for 5–10% of all adult soft tissue sarcomas in the world. We present a case with primary superficial cutaneous synovial sarcoma without involvement of the underlying knee joint. It is a very rare condition, and to the best of our knowledge, it is the second report of this topic. Although it is rare among soft tissue tumors, the dermatologists should have precise attention to this skin tumor, as early diagnosis is associated with lower metastatic rate and therefore better prognosis.