Summer activities can increase the risk of developing warts, especially plantar warts that appear on the soles of the feet. Warts are caused by the human papillomavirus (HPV), which thrives in warm, moist environments such as swimming pools, locker rooms, and public showers. Walking barefoot in these areas can make it easier for the virus to enter through tiny cuts or breaks in the skin. To reduce your risk, wear sandals in public wet areas, keep feet clean and dry, and avoid sharing towels or footwear. If a wart develops, your pharmacist can recommend treatment options and prevention tips.