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. 2021 Sep 24;47(1):188–190. doi: 10.1111/ced.14878

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© 2021 British Association of Dermatologists

This article is being made freely available through PubMed Central as part of the COVID-19 public health emergency response. It can be used for unrestricted research re-use and analysis in any form or by any means with acknowledgement of the original source, for the duration of the public health emergency.

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(a) Prominent alternating orthokeratosis and parakeratosis in horizontal and vertical directions. The epidermis showed mild irregular acanthosis with broader rete ridges than expected in a psoriasiform reaction. There was mild and focal spongiosis with slight lymphocytic exocytosis. There was also mild perivascular and perifollicular lymphocytic inflammation within the papillary dermis with neutrophils and occasional eosinophils seen focally. (b) Prominent alternating orthokeratosis and parakeratosis in the distinct ‘checkerboard’ pattern. Haematoxylin and eosin, original magnification (a) × 20; (b) × 600.