Plantar warts are generally caused by a viral infection and develop on the bottom of the foot. They show up as thick growths that can become sensitive to the pressure placed on them.
Athlete’s foot is a fungal skin infection that is contagious. Public facilities or gym locker rooms are common areas where this infection is picked up because most people walk around barefoot.
Corns start out as thin layers of dead skin on the feet and can become hard or soft. They can form between toes or on the top of them. They can become painful from infections or from the pressure they create on the skin.