sQUIZ your knowledge! Progressive thickening and hardening of the skin on the upper back. Sun J, Yi S, Tu P. Eur J Dermatol 2021;31:855-857.

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Sun J, Yi S, Tu P. sQUIZ your knowledge! Progressive thickening and hardening of the skin on the upper back. Eur J Dermatol 2021;31:855-857.
PMID: 35107080