Sun Exposure, Over Time
Sun-Exposed Skin, Over Time
Sun exposure accumulates quietly, over decades, mostly during ordinary days. Here is what that adds up to, how to care for skin that has had a lot of it, and when to ask someone.
Most sun exposure is not sunbathing.
When people think about sun exposure they picture a beach. Most of it does not happen there. It happens in small amounts, on ordinary days, over a very long time — and it is the accumulation that matters rather than any one afternoon.
Summers spent outdoors, long before anyone routinely used sun protection, and long before daily sunscreen was something most people had heard of.
The hands and forearms can receive substantial incidental sun exposure during driving, errands and other ordinary activities. Very few people apply sun protection for those.
Exposure is cumulative. What shows up later reflects decades of it, not last summer.
This is also why exposure is so unevenly distributed across one person's own body. The backs of the hands, the forearms, the face, the ears, the neck and — for anyone whose hair has thinned — the scalp tend to accumulate far more lifetime exposure than skin that has spent most of its life under clothing.
What Decades of Sun Exposure Do to Skin
Ultraviolet radiation reaches the skin in two forms that matter here. UVB is largely absorbed in the outer layers. UVA penetrates deeper, into the layer where the skin's structural proteins live. Both contribute to change over time, and UVA passes through ordinary window glass, which is part of why driving counts.
Over many years, cumulative UV exposure can affect collagen and elastin — the proteins that give skin its firmness and its ability to spring back. As that structure changes, skin in heavily exposed areas may:
- feel drier or rougher to the touch than it once did
- look less even in tone, with lighter and darker areas developing gradually
- lose some elasticity, so it takes longer to settle back after being pinched or stretched
- show fine lines and deeper creases
- show small blood vessels closer to the surface
- become thinner-feeling and more easily marked
These changes tend to arrive slowly enough that they are easy to miss year to year. They can also vary a great deal between people with similar sun histories, because how skin responds to UV differs from person to person.
One comparison that is genuinely informative
If you want a sense of how much your own exposure has added up, compare an area that has spent most of its life uncovered — the back of a hand, say — with an area that has spent most of its life covered, such as the skin of the inner upper arm.
That comparison illustrates the difference decades of exposure can make. It is worth being precise about what it does not do: it cannot tell you whether any particular area has changed. Only earlier photographs of that same area can establish that.
Caring for Skin That Has Had a Lot of Sun
Protection is not only for people who have not accumulated much exposure yet. Reducing further UV exposure is worthwhile at any age and after any amount of sun.
Protect what is already exposed
- Use a broad-spectrum sunscreen of SPF 30 or higher on skin that will be uncovered, and reapply roughly every two hours outdoors, and after swimming or heavy sweating.
- Include the places that get skipped — the backs of the hands, the ears, the sides and back of the neck, and the scalp if hair is thin there.
- Remember the car. Side windows block far less UVA than most people assume, and the arm nearest the window takes the difference.
- Clothing does work that sunscreen does not. Long sleeves, a wide-brimmed hat and driving gloves need no reapplication.
- Take shade during the hours when the sun is highest, where that is practical.
Be gentle with the skin itself
- Wash with a mild cleanser rather than scrubbing. Skin that has thinned with age and exposure does not respond well to abrasion.
- Moisturize regularly, particularly on the hands and forearms, which are washed often and exposed often.
- Give aggressive at-home exfoliation a wide berth on heavily exposed skin, and introduce any new active ingredient slowly.
Keep your own record
If there is an area you want to keep an eye on, photograph it. Use a ruler in the frame for scale, take the picture from roughly the same distance and angle each time, and note the date. Record both its appearance and any changes over time. That record exists to make a future appointment more useful, not to replace one.
The ruler is practical framing rather than sourced guidance. On documenting what you find, see the Skin Cancer Foundation's guide to self-examination.
About AK Botanicals
AK Botanicals makes precision skincare for small, targeted areas of sun-exposed skin.
What AKti-Clear® isCommon Questions
Does sun exposure only matter if I spent time sunbathing?
No. Incidental exposure during driving, walking, gardening, errands and other ordinary activities accumulates over decades, and for most people it accounts for far more lifetime exposure than deliberate sunbathing does.
Is there any point protecting skin that has already had decades of sun?
Yes. Reducing further UV exposure is worthwhile at any age. Past exposure cannot be undone, but it does not make future exposure irrelevant.
Do I need sun protection on cloudy days, or indoors near a window?
Cloud cover reduces UV but does not remove it. Ordinary window glass blocks most UVB but lets a good deal of UVA through, which is why the arm nearest a car's side window can accumulate noticeably more exposure than the other one.
How should I look after skin that has had heavy sun exposure?
Protect it from further UV, wash it gently rather than scrubbing, moisturize regularly, and go carefully with strong exfoliants and new active ingredients. If there is an area you want to keep an eye on, photograph it with a ruler for scale and note the date.
When to Ask Someone
If Something Is New, Changing or Unusual
Everything above is about ordinary care. It is not a way of deciding what any particular area of your skin is, and it is not meant to be used that way.
If you notice an area that is new, that is changing, or that simply strikes you as unusual, arrange an evaluation with a qualified professional. The American Academy of Dermatology has guidance on arranging that evaluation.
People often put this off because the area seems too small or too unremarkable to take up someone's time. Bring the photographs and the dates you recorded. A short appointment about something that turns out to be nothing is a perfectly good use of an appointment.