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. 2021 May 13;10(10):2086. doi: 10.3390/jcm10102086

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Characteristic bluish-gray discoloration of the nails (azure lunula), namely of the lunula due to silver exposure. In D comparison with regular nails is provided. Reprinted from (A)—[67], (B)—[68], (C)—[66], and (D)—[69].