The plantar warts on the feet are also caused by HPV infection, which is also known as human papillomavirus infection. It is best to go to a regular hospital for liquid nitrogen freezing treatment or warmth therapy, liquid nitrogen freezing treatment after the local may appear blisters, edema, serious cases will also appear blood blisters. After about 2-3 weeks, the blisters can dry up and the rash will fall off. However, some patients may require multiple treatments before the rash can completely subside. It is best not to break the blisters, as this may lead to a new rash around the walls of the blisters.