There are some very convincing salves, pastes, poultices, and plasters which when added to tumors burn them away. Zinc oxide and several other herbs are common ingredients. Some claim that corrosives ("black salves") can "draw out" the cancer. Recently, scientists have isolated chemicals that can destroy particular skin cancers. But except for these, corrosive substances are useless against cancer and cannot be legally promoted for that purpose in the U.S.
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