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. 2019 Mar 7;180(5):1058–1068. doi: 10.1111/bjd.17583

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© 2018 The Authors. British Journal of Dermatology published by John Wiley & Sons Ltd on behalf of British Association of Dermatologists

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Histological representative cases of classical cutaneous viral warts. (a) Verruca vulgaris: haematoxylin and eosin (H&E) low‐power view (original magnification × 50) with architectural characteristic inturning of the elongated rete ridges, epidermal hyperplasia, papillomatosis, hypergranulosis, hyperkeratosis and columns of parakeratosis. (b) Verruca vulgaris: H&E, detail view (× 200). Note koilocytes (arrowheads) and coarse granuloma (arrows) mostly in the top layers (stratum granulosum). (c) H&E low‐power view (× 50) of verruca plana with epidermal hyperplasia, hypergranulosis, hyperkeratosis and koilocytes in the middle and upper layers. (d) Verruca plana: H&E, detail view (× 100). Note the absence of papillomatosis, parakeratosis and coarse granuloma.