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The most common cause of age spots, also known as liver spots, on the torso as well as the arms, neck, and face, is overexposure to the sun. These light- to dark-brown flat spots can increase in size over time and take years to develop; most effect those over 40. They are, for the most part, harmless, and appear due to changes in skin pigmentation from sun exposure. If a spot is painful or not flat, then it is important to consult a physician immediately.
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