Flat wart

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".[1][2] Most often, these lesions affect the hands, legs, or face, and a linear arrangement is not uncommon.[2] At histopathology, flat warts have cells with prominent perinuclear vacuolization around pyknotic, basophilic, centrally located nuclei that may be located in the granular layer.[3] These are referred to as "owl's eye cells."[3]

Flat wart
Other namesVerruca plana
Verruca plana (flat warts) on the chin of a middle-aged woman
SpecialtyDermatology 

Additional images
Micrograph of a flat wart

References
  1. Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. p. 1188. ISBN 978-1-4160-2999-1.
  2. Lookingbill, Donald, et al. Principles of Dermatology. Saunders. 2000. Pages 68-69. ISBN 0-7216-7971-4.
  3. Ahmad M. Al Aboud; Pramod K. Nigam (2021). "Wart". Wart (Plantar, Verruca Vulgaris, Verrucae). StatPearls at National Center for Biotechnology Information. StatPearls.{{cite book}}: CS1 maint: multiple names: authors list (link) Last Update: May 13, 2019.
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