Snapshot A 6-year-old girl presents to the pediatric dermatologist’s office for multiple warts on her hands and feet. She reports that they are not physically painful or itchy, but they are embarrassing. Her friends avoid touching her because of the warts. Her past medical history includes atopic dermatitis. On physical exam, she has multiple 4-5 mm flesh-colored papules. Because of the associated stigma at school, the pediatrician suggests using topical salicylic acid to treat these lesions. Introduction Clinical definition cutaneous warts, or verrucae, are skin lesions caused by infection with human papillomaviruses (HPVs) common forms login to view 8 more bullets Epidemiology Demographics children and young adults Risk factors atopic dermatitis immunosuppression walking barefoot in communal swimming areas occupations handlers of meat and fish Etiology Pathogenesis transmitted through contact with infected skin of mucous membranes warts contain high viral load virus invades epidermal basal layer through microabrasions and are confined to epidermis incubation period is 2-6 months HPVs over 150 subtypes Presentation Symptoms asymptomatic commonly appear at sites of trauma Physical exam commonwarts flesh-colored papules can be cauliflower-shaped or smooth black dots, which are thrombosed capillaries, appear when pared with a surgical blade hands are most commonly involved flat warts pink, light brown, or light yellow flat-topped papules most commonly on mouth and forehead plantar warts on plantar surface of feet, often at points of maximum pressure accompanied with thick callus single or grouped lesions warts on adjacent toes “kissing lesions” Studies Biopsy indications if diagnosis is unclear Histology epidermal hyperplasia hyperkeratosis koilocytosis Diagnostic criteria a clinical diagnosis Differential Seborrheic keratosis “stuck on” appearance Acrochordon (skin tags) pedunculated Treatment Medical destruction of warts indications login to view 3 more bullets modalities login to view 6 more bullets topical immunotherapy indications login to view 1 more bullet modalities login to view 3 more bullets Complications No significant complications Prognosis Often spontaneously resolves in children Often require several sessions of treatment in adults