Statistics suggest that between 50% and 80% of people over the age of 40 will develop at least a few of these spots. They are considered a natural part of the skin’s aging process.
Why Do They Appear?
The primary cause of IGH is long-term sun exposure. Over time, ultraviolet (UV) radiation damages melanocyte cells—the cells responsible for producing melanin. When these cells stop functioning or disappear altogether in small areas of the skin, those areas become lighter than the surrounding skin.
In short:
Sun exposure damages pigment-producing cells
Less melanin is produced in specific spots
Those areas appear white or pale
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