What are solar lentigines commonly caused by?

Solar lentigines, often referred to as age spots or liver spots, primarily result from prolonged sun exposure. These are localized areas of increased pigmentation that occur due to the overproduction of melanin in response to ultraviolet (UV) radiation from the sun. The skin cells, particularly melanocytes, react to prolonged exposure by producing more pigment, leading to the formation of these spots.

While genetic factors can contribute to skin type and the way skin ages, and harsh chemicals or infections might affect skin health in other ways, solar lentigines are distinctly tied to the cumulative effects of UV exposure over time. This connection underscores the importance of sun protection and awareness of how sun exposure can lead to visible changes in the skin, particularly as individuals age.