The scientific community has identified over 100 strains of the virus causing warts, HPV, and the number continues to grow. Therefore, some strains of HPV are more virulent than others and may require continued treatment to completely eradicate the warts from the skin. Generally, most people experience eradication of warts from using our warts products in 2-5 weeks. However, those infected with a more stubborn strain may require up 3-4 months of treatment before seeing desired results. As such, we recommend that you continue to use the product to achieve the desired therapeutic effect to eventually clear the infection. If you experience skin irritation discontinue use.