Scars do not tan in the same way as normal skin. A new, pink scar that is exposed to sunlight can darken permanently (hyperpigmentation), while a mature, white scar usually has fewer working pigment cells and stays pale as the surrounding skin tans, making it more noticeable. The safest approach is to protect any scar from the sun for at least the first 12 to 18 months.
Why scar skin behaves differently
Skin colour comes from melanin, a pigment made by cells called melanocytes in the lower part of the outer skin layer. When a wound heals, the new scar tissue is organised differently from normal skin, and the pigment cells within it may be fewer in number, damaged or overactive. It also lacks normal hair follicles and sweat glands. As a result, a scar can react unpredictably to sunlight, and that reaction differs depending on how old the scar is.
New scars: the risk of darkening
In the first months after an injury or operation, a scar is still inflamed and has an increased blood supply, which is why it looks pink or red. Pigment cells in and around the healing wound can respond to ultraviolet light by producing excess melanin. The scar may turn brown or darker than the surrounding skin, and this change can last for years or be permanent. People with medium and darker skin tones are especially prone to this post-inflammatory hyperpigmentation, although it can happen to anyone.
Mature scars: staying pale
Once a scar has matured, typically after 12 to 18 months, it is often paler than the surrounding skin. Many mature scars contain very few functioning pigment cells, so they do not darken when the rest of the skin tans. The contrast between a white scar and tanned skin can make the scar stand out more in summer. Mature scar skin is also thinner and may burn more easily, so it still benefits from protection.
How to protect a scar from the sun
- Cover it: clothing, swimwear or a plaster is the most reliable protection, particularly in the first few months.
- High-factor sunscreen: use a broad-spectrum SPF 50 once the wound is fully closed, reapplied every two hours and after swimming.
- Silicone with SPF: some silicone scar gels include sun protection, which is convenient for exposed areas such as the face.
- Avoid sunbeds: sunbeds emit strong UV and can darken a healing scar just as sunlight does.
- Keep it up for longer: continue protecting the scar for at least a year, and on holidays for longer.
Can fake tan be used on a scar?
Self-tanning products colour the outermost layer of dead skin cells rather than stimulating melanin, so they do not carry the same risk as UV. Wait until the wound is completely healed and any scabs have gone, patch test first, and be aware that scar skin may take up the colour differently, sometimes looking darker or patchy. Camouflage make-up designed for scars is another option for special occasions.
What if a scar has already darkened?
Hyperpigmentation often fades gradually over many months once the scar is protected from further sun. Consistent SPF use is the most important step. Some people are prescribed lightening creams by a doctor, and certain resurfacing treatments are offered by dermatology clinics, but these carry their own risks, including worsening pigmentation in darker skin. If a scar is also raised, wide or tethered, scar revision may be considered once the scar has matured, followed by careful sun protection of the new scar.
When a scar needs checking
Most colour changes in a scar are harmless. However, see your GP promptly if a dark area develops within a scar and is changing in size, shape or colour, bleeds, itches persistently or looks different from the rest of the scar, as any changing pigmented lesion should be assessed. The ABCDE guide used for moles (asymmetry, border, colour, diameter and evolution) is a helpful prompt.
Frequently Asked Questions
Will a white scar ever tan?
Usually not. Mature white scars often have few working pigment cells, so they stay pale while surrounding skin tans.
How long should a new scar be kept out of the sun?
At least 12 to 18 months, until it has fully matured. Many surgeons advise continued protection for longer on holidays.
Does sunscreen stop a scar going dark?
A high-factor, broad-spectrum sunscreen used consistently greatly reduces the risk, although covering the scar is more reliable.
Is it safe to use a sunbed after surgery?
Sunbeds should be avoided, as their UV can darken a healing scar and also damages the skin.
Can a darkened scar be lightened?
Hyperpigmentation often fades slowly with strict sun protection. A consultation can help decide whether any further treatment is worthwhile.
