I got a random mole on my pinky finger. Just king of appeared out of no where. About a millimeter in diameter could it be bad?

Keep any eye on it. Any changing mole requires attention. But the size does matter in order to get suspicious about a mole changing into a melanoma(cancer of the skin). If your mole increases in size up to 4-5 millimeters, then i would suggest that you consult a doctor or go see a skin specialist(dermatologist) for his/her opinion.