[header] How to undergo a mole biopsy [title] Get a punch biopsy. [step] A punch biopsy is when the doctor uses a special tool to punch into the skin around the mole. The tool has a circular blade. 
First, the doctor will numb the skin around the area being biopsied with a needle. Then, they will press the tool to the skin to remove a circular piece of skin to biopsy.