Cauterization and Cryotherapy (freezing) are two common treatments for warts on the skin.
Cauterization is more often used as a treatment for smaller warts on the skin, like flat warts. Skin after cauterization treatment will form scabs of similar size to those under treatment. After the falling off of the scab, the skin may show a certain degree of pigmentation, which will be gone within a few weeks to a few months normally, depending on the skin condition of individuals.