Spots linked to sun exposure and age
UV rays cross through the epidermis and stimulate the skin’s pigmentation cells (melanocytes). Some melanocytes are continuously disrupted and start to secrete large amounts of melanin all the time. Spots appear when melanin production increases in an abnormal manner and when over-produced melanin isn’t uniformly distributed over the skin’s surface. This causes it to accumulate in certain spots and form unsightly marks.
Excessive sun exposure (too intense or too long) over time results in the over-production of melanin, leading to pigment spots or lentigos (small, round and flat spots that vary in size).
That is why people who work outdoors (people in the marine industry, construction workers, etc.) tend to develop these spots earlier than other people.
Moreover, the risk of hyperpigmentation increases with cell ageing and generally affects the areas that are most exposed to the sun over time (face, neck, hands, etc.). The sun and age are the main causes of pigment spots. This is called either solar lentigo or senile lentigo. Lentigo affects 90% of white people over the age of 50 years. All skin types are affected.