The majority of moles are non-cancerous and will pose no problem throughout a person’s lifetime. There are certain moles, however, that will begin to change in size, shape or color and give the doctor reason to be alarmed. When moles change shape and they are no longer equally balanced or if the border changes dramatically, a doctor may opt for a biopsy to see if the mole is cancerous. The color and diameter of a mole should also be closely monitored. Moles often change gradually making it difficult for a patient to notice all of the individual differences. In most cases, if a doctor notices any of these changes, they may choose to surgically remove the mole before they have it biopsied.