Flat wart

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| caption = Verruca plana (flat warts) on the chin of a middle-aged woman

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| synonyms = Verruca plana

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Flat warts, technically known as verruca plana, are reddish-brown or flesh-colored, slightly raised, flat-surfaced, well-demarcated papule of 2 to 5 mm in diameter. Upon close inspection, these lesions have a surface that is "finely verrucous".{{cite book |author=Rapini, Ronald P. |author2=Bolognia, Jean L. |author3=Jorizzo, Joseph L. |title=Dermatology: 2-Volume Set |publisher=Mosby |location=St. Louis |year=2007 |pages=1188 |isbn=978-1-4160-2999-1 }}Lookingbill, Donald, et al. Principles of Dermatology. Saunders. 2000. Pages 68-69. {{ISBN|0-7216-7971-4}}. Most often, these lesions affect the hands, legs, or face, and a linear arrangement is not uncommon. At histopathology, flat warts have cells with prominent perinuclear vacuolization around pyknotic, basophilic, centrally located nuclei that may be located in the granular layer.{{cite book|chapter-url=https://www.ncbi.nlm.nih.gov/books/NBK431047/|title=Wart (Plantar, Verruca Vulgaris, Verrucae)|author=Ahmad M. Al Aboud; Pramod K. Nigam|chapter=Wart|year=2021|publisher=StatPearls|pmid=28613701 }} Last Update: May 13, 2019. These are referred to as "owl's eye cells."