Light brown spots or freckles are clusters of hyperpigmentation. The don't exactly hurt anything but they are a sign of sun exposure and the left hand is the one that gets the most exposure while driving.
Dark or black spots that increase in size or change shape should be examined by a doctor.
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One thing that causes dark spots on your hands and lips is too much sun exposure. It is important to protect your skin when in the sun.?æ
it may just be a spot with more pigment than others, that you have alot of beauty marks or moles, or you have cancer, you should go see your doctor about it.