Guarneri, C., Rullo, E. V., Pavone, P., Berretta, M., Ceccarelli, M., Natale, A., & Nunnari, G. (2020). Silent COVID-19: What your skin can reveal. The Lancet Infectious Diseases, S1473309920304023. https://doi.org/10.1016/S1473-3099(20)30402-3

A biopsy is when a piece of tissue is removed from an area of the body, typically near an infection or "tumour", for analysis and examination.