What happens if i remove a mole at home & that mole was cancerous?

Only God knows what: First, you should never do this as you can only complicate your life and make it impossible for your doctor to tell what was this lesion in the first place...It may have been benign or a melanoma...If it was a brown or black mole(red ones are usually benign). If it was a cancer, it may reappear in the same spot or in th nearby areas like skin or lymph nodes draining the skin of this area. Good luc.