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]
Additional images
Micrograph of a flat wart
Woman with extensive flat warts on her face
References
^Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. p. 1188. ISBN978-1-4160-2999-1.
^ abLookingbill, Donald, et al. Principles of Dermatology. Saunders. 2000. Pages 68-69. ISBN0-7216-7971-4.
^ abAhmad M. Al Aboud; Pramod K. Nigam (2021). "Wart". Wart (Plantar, Verruca Vulgaris, Verrucae). StatPearls. PMID28613701. {{cite book}}: |website= ignored (help)CS1 maint: multiple names: authors list (link) Last Update: May 13, 2019.