结节
皮肤内物质更广泛的增加，＞ 5 mm，容易摸到，通常边界清晰
颜色：肤色、褐色、红色、黄色
可以在身体任何部位发生；可以为单一、局限性或播散性。
可以发展为坏死、溃疡或瘢痕。
丘疹和结节的区别仅为大小不同
较大的结节即为肿瘤（良性或恶性细胞增生）
囊肿为由囊壁包裹液体形成的结节。
肿瘤：结节型基底细胞癌、结节型黑素瘤
感染：疖、脓肿
炎症性疾病：痒疹、结节性红斑、结节病
囊肿：表皮样囊肿、毛鞘囊肿
良性和恶性细胞增生（肉芽肿、肿瘤）
分泌物滞留（表皮样囊肿）
炎症（疖、脓肿）
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