Since the melanocytes are stuck producing melanin over and over again, these melanin are transferred to the surrounding cells and get stuck in the epidermis and appear not shed away with the daily skin renewal process.
This appears on your skin’s surface as uneven skin tone and darkened skin. At this stage, if your skin continues to be exposed to UVA and UVB rays, then, photo ageing occurs deep inside and your skin takes on a spotted and leathery appearance on the outside.
What’s so bad about photo ageing?
Photo ageing is a result of UV damage in your skin. UV damage causes skin cells to release enzymes that lead to more damage. The fibroblasts in your dermis unwind and become disorganized. This weakens the internal support structure of your skin.
If UV-damaged skin continues to be exposed to more sun, the photo ageing process occurs.
When the internal support structure of skin collapses, the dermis becomes thinner and starts to sag. Meanwhile, the elastin and collagen in your skin begins to degenerate as a result of UVA injury. All this accumulated damage makes skin visibly less firm, less supple, and cause solar elastisis— the loss of elasticity in skin, making it difficult for the skin to renew itself.
When this prolonged sun-exposure damage continues over time, photo ageing goes into hyperspeed, causing more damage in your skin.
Thankfully, there are ways to prevent the appearance of dark marks and other photo ageing process in your skin.