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男，41岁，月余前出现双下肢疼痛，未经治疗面愈。1周前全身疼痛，双膝红肿，皮肤有结节性红斑。
Male, 41 years old, with lower extremity pain appeared more than a month ago, untreated more. A week ago, body aches, knees and redness, skin erythema nodosum.