How can I get my dad to come to his senses and stop burning himself?

minibigproblem
So my dad bought a machine that heats up, its like a pen and the end of it heats up. My dad has been burning himself because he thinks he is getting rid of cancer by burning his moles. I told him if he’s worried about cancer he should go check with a doctor. I understand the fear of coming out positive but I’m scared. He said he doesn’t need to go to a doctor. I don’t want him to hurt himself.
How can I get my dad to come to his senses and stop burning himself?
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