Wart is a small rough growth over the skin resembling cauliflower. Sometimes it can be smooth.

It is caused by various strains of Human Pappiloma Virus (HPV)

This is a contagious disease and spreads when a broken skin comes in contact with a person having warts. It can affect any part of the body.

Common Warts : small swellings with uneven surface and can occur anywhere in body.
Plane Warts : small round smooth lesions usually multiple over the face or arms.
Filiform Warts : Finger like projections seen over it. Most of the time over the face.
Genital Warts : This can be sometimes glistening. Need to examine all your sexual partners and treat them if needed.
Plantar Warts : this can be painful sometimes , little dark ones over the soles.

Topical preparations like Salicylic Acid or Retinoid creams are used as exfoliators and keratolytic to reduce the number and size of the lesions. Small ones might be cured with this.
Radiofrequency : Cautery or Hyfrecation is the most common procedure done in almost every skin clinic for the warts where these lesions are burned with their roots to prevent recurrences.
Cryotherapy : This is the ideal method to treat for warts over the fingers, hand and genitals where the warts are freezed using Liquid Nitrogen . This might require multiple sessions though.
Autoinoculation : As body doesnt have any immunity against the virus this procedure is performed if the warts and recurrent in nature where small bits of warts are inserted into a pocket created in deep dermal layer of the skin.