Melanoma arising in a persistent nevus: Melanoma where 'pseudomelanoma' is expected by Thomas N. Helm, MD, Matthew F. Helm, MD, Klaus F. Helm, MD

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Metastatic melanoma with features of blue nevus and tumoral melanosis identified during pembrolizumab therapy by Matthew F. Helm, MD, Michael J. Bax, MD, Paul N. Bogner, MD, Catherine G. Chung, MD

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The prevalence and geographic distribution of sarcoidosis in the United States by Hannah H. Nam, BA, Abigail Washington, BA, Melissa Butt, DrPH, Steven Maczuga, MS, Daniel Guck, DO, Jeff D. Yanosky, ScD, MS, Matthew F. Helm, MD

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Challenges for dermatologists during the COVID-19 pandemic: A qualitative study by Matthew F. Helm, MD, Alexa B. Kimball, MD, MPH, Melissa Butt, MPH, Heather Stuckey, MEd, DEd, Heather Costigan, BS, Kanade Shinkai, MD, PhD, Arielle R. Nagler, MD

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