Warts are common, contagious but benign epithelial tumours caused by the human papillomavirus (HPV).
Warts may appear at any age but most frequently occur in children.

Types of warts include:
* Common warts (Verruca vulgare)
* Flat warts (Verruca plana)
* Genital warts (Condyloma acuminatum)
* Plantar warts (Verruca plantaris)

All warts can be spread by direct or indirect contact, and can spread from one part of the body to another. Warts can disappear without treatment, and recur throughout a patient’s life. Benign neglect may be an acceptable treatment for warts, as 65% resolve within 2 years. Without treatment, however, patients risk warts that may enlarge or spread to other areas.
Treatment is recommended for patients with extensive, spreading, or symptomatic warts or warts that have been present for more than 2 years.

Aetiology/Major causative factors and risk factors that can contribute to the incidence of warts include:
* Contact with affected persons or shed skin with HPV (particularly for genital warts)
* Trauma
* Immunosuppressive diseases and/or immunosuppressive drugs
* Atopic dermatitis
* Communal facilities (locker rooms)

Symptoms & Signs:
Common warts:
* Round and asymmetric
* Can grow from tiny (1 mm), smooth, flesh-tone papules to large (5 to 10 mm),thick, rough plaques
* May form mosaics (1 to 3 cm in diameter)
* Found anywhere, but generally on the hands

Flat warts:
* Small (1 to 3 mm) papules with flat tops
* Usually flesh-tone or pink
* Sometimes itchy
* Generally found on the face and back of hands

Genital warts (venereal warts):
* Tiny flat papules that grow to resemble common warts
* Generally found on external genitalia, pubic, and perineal regions
* May be found intravaginally and in the anal canal

Plantar warts:
* Rough, thickened, scarcely elevated papules
* Sometimes exhibiting black dots, indicating thrombosed capillaries
* Often quite tender, possible leg/back pain from disrupted posture
* Found on the sole of the foot, sometimes completely covering the heel or plantar region