Salicylic acid, a caustic substance, can treat a variety of skin problems, including acne, psoriasis, dermatitis, corns, calluses and warts. Many over-the-counter wart treatments, for plantar warts on the feet and common warts on the fingers and hands, contain salicylic acid.

Plantar warts develop on the soles of the feet and can be difficult to treat. According to MayoClinic.com, they are very contagious, have a tendency to be painful and sometimes require a doctor’s assistance for removal.

Plantar warts are small, non-cancerous growths that appear on the bottom of the foot. Warts are viral, caused by the HPV virus. Some plantar warts go away on their own, while others require treatment.

If you notice a rough, round bump on your finger that seemed to appear out of nowhere, you may have a wart. Warts that appear on the fingers are known as common warts and are caused by the human papillomavirus, says the Mayo Clinic. In most cases, warts on the fingers are not a serious medical condition.

There are several old wives tales for curing wart, including spreading butter on your wart, then letting the dog lick the butter off; sleeping on your favorite quilt for 30 days; and even piercing the wart with a needle until you see blood, then burying the needle in the dirt.

Caused by the human papilloma virus, or HPV, warts are skin growths that are usually painless and harmless and can appear anywhere on the body. Plantar warts are found on the soles of the feet and, being subjected to pressure, can make walking painful.

Flat warts are found most commonly in children and teenagers. Caused by the human papillomavirus, they are flat-topped, smooth and small—around the size of a pinhead. Flat warts often form in clusters on the face, and also on the neck, hands, arms and legs.

Warts are small lesions in the top layer of the skin caused by strains of the human papillomavirus. The flesh- or pink-colored growths commonly appear on hands and feet but may also grow on your face. While warts often disappear over time, facial warts can spread and become embarrassing, bothersome and painful.

Molluscum contagiosum is a skin infection caused by a virus that affects both adults and children. In children, the viral infection is transmitted through skin-to-skin contact and typically causes wart-like bumps or papules on the hands, neck, arms and face.

Human Papillomavirus, or HPV, is the cause of warts on the skin. The Mayo Clinic reports that more than 100 HPV strains exist. Most common are those types spread through sexual contact, which includes about 30 strains.

Warts are small growths appearing singly or in clusters on various surfaces of the body. Common warts, plantar warts and genital warts are all caused by the human papillomavirus, or HPV. Regardless of the type of wart, there are several vitamins that may help kill the virus and heal the affected area.

Warts and calluses aren't usually painful, but can be unsightly and annoying. According to the Mayo Clinic, warts are skin growths caused by the human papillomavirus virus. Calluses are hardened layers of skin that develop from the skin trying to protect itself against pressure.