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Figure 2: “A boy with a skin disease of the scalp. By W. Bagg, 1847.” (Credit: Wellcome Collection. CC BY 4.0 http://creativecommons.org/licenses/by/4.0/)

Figure 2: “A boy with a skin disease of the scalp. By W. Bagg, 1847.” (Credit: Wellcome Collection. CC BY 4.0 <a target=http://creativecommons.org/licenses/by/4.0/)">