If your 5-year-old son has two warts on his foot, you can try treating them with over-the-counter products containing salicylic acid. You can soak the foot in warm water, gently rub the wart with a pumice stone, dry it, apply a protective substance like Vaseline, apply the treatment, and cover it with a bandage if necessary. Repeat these steps for up to 12 weeks, and if there is no improvement, consider consulting a healthcare professional for alternative treatments. Warts can sometimes go away on their own, but it's important to take precautions to prevent them from spreading.