A 67-year-old man with chronic kidney disease and diabetes mellitus type 2 was referred for an ultrasound examination under the suspicion of an abscess on his forearm. He suffered from low-grade fever, and right forearm pain and swelling for several days after intravenous catheter placement. An erythematous, warm, swollen, and mildly indurate area of 10 cm x 5 cm was found over his right forearm (Fig. 1A-D). What is the diagnosis? (The answer will be provided in the next issue.)
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机译：一名67岁的患有慢性肾脏疾病和2型糖尿病的男子因涉嫌前臂脓肿而接受超声检查。静脉置管后几天，他患有低烧，右前臂疼痛和肿胀。在他的右前臂上发现了一个10 cm x 5 cm的红斑，温暖，肿胀和轻度硬结的区域（图1A-D）。诊断是什么？ （答案将在下一期中提供。）
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