Mole in general can change through the years and you have to be careful to have them checked if you see them change because they can become cancerous.so piercing through it might make the phenomena quicker and might make the change in the cells take place .so more risk for cancer .
it should be examined especially if there is change in color or size or anything else.
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It is recommended that all individuals see a Family Doctor for a full medical examination annually. Adults should get their blood pressure checked (US Preventive Task Force), a flu vaccine (CDC) and more each year.