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An external skin swelling is known as a:
papule
macule
tumor
pustule
The correct answer is: tumor
A papule is a small, solid, elevated lesion on the skin, whereas a macule is a flat, distinct, discolored area of the skin. A pustule is a small, elevated, pus-filled lesion on the skin. These terms do not specifically refer to an external skin swelling, making them incorrect options. A tumor, on the other hand, is a general term for any abnormal growth of tissue, typically swelling, and can occur externally on the skin. Therefore, it is the correct answer for this question.