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Posterior view of a lower back and buttocks of a 13-year-old girl from Goroka, New Guinea, showing an ulcerative, papillomatous lesion due to yaws

The first sign of yaws is the appearance of a painless papule that grows into a papilloma. These early granulomatous lesions are characterized by a yellow-crusted appearance and are highly infectious. (Source: Photography by K. McLennon, Tulane Univ. Medical School, courtesy of Clement Benjamin, Centers for Disease Control and Prevention, 1965. Public Health Image Library [PHIL] ID# 3840, Centers for Disease Control and Prevention, Atlanta, Georgia. Public domain.)

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