To the Editor: More than 3 million people are affected by keratinocyte carcinomas (KCs) in the United States, an often-cited estimate from Medicare claims and population survey data for patients 65 years old and older. 1 Rogers H.W. Weinstock M.A. Feldman S.R. Coldiron B.M. Incidence estimate of nonmelanoma skin cancer (keratinocyte carcinomas) in the U.S. population, 2012. JAMA Dermatol. 2015; 151 : 1081-1086 However, less is known about KCs in younger populations.