Risk factors for warts include:
- Having an impaired immune system.
- Your age. Warts occur most often in children and young adults. As you get older, you may find that you get fewer warts or that your warts go away.
- Walking barefoot on moist surfaces, as in public showers and locker rooms and around swimming pool areas.
- Sharing towels, razors, and other personal items with a person who has warts.
- Biting your nails or cuticles.
- Wearing closed or tight shoes that cause sweaty feet.