A keratotic
papilloma of the
epidermis which occurs most frequently in
young persons as a
result of
localised infection by
human papilloma virus, generally types 2 and 4; the lesions are of
variable duration, eventually undergoing
spontaneous regression, and are both
exophytic and endophytic, with hyperkeratosis, parakeratosis, hypergranulosis, koilocytosis, and papillomatosis.
Synonym:
general wart,
infectious warts,
verruca simplex,
viral wart.