(See also Overview of Nail Disorders.)
Verruca vulgaris is the common wart.
Verruca vulgaris is caused by infection with human papillomavirus and frequently infects the cuticle (the skin at the base of the nail) and sometimes the area beneath the nail (see Warts). Nail biting (onychophagia) can spread this infection. Warts in these areas are especially difficult to treat. Freezing (cryotherapy) with liquid nitrogen may be effective.
Prescription medications are often needed for chronic infections. These include topical 5-fluorouracil and imiquimod.