Understanding Sun Exposure & Skin

The sun's UV and visible light harm brown skin too: they deepen marks and patches, worsen melasma, and over years make skin rougher and more lined. UV is present on cloudy days too. Daily sunscreen, shade and covering clothes are the best-proven ways to reduce this; there is no guarantee that damage already done can be fully reversed.

Written by the Oliareen editorial teamDermatologist review: pendingLast updated: 6 November 2026How we write

What sun does to skin

UVB burns, UVA reaches deeper and damages collagen, and visible light can drive pigment in brown skin. Melanin gives brown skin some natural protection, so it burns less, but marks and uneven tone are more common. The damage adds up over time.

Sun in Bangladesh

UV is high year-round; it is present even on cloudy monsoon days.
Rickshaws, bus stops and walks add up to a lot of daily sun.
Sweat and wiping remove sunscreen, so reapplying outdoors matters.
Pollution and sun together can increase pigmentation.

What sun damage can look like

Some marks that look like sun spots have other causes; always show a doctor any new or changing spot.

Acne marks and patches darkening.
Larger, sharp brown spots on sun-exposed areas (solar lentigines).
Rough texture, uneven tone, fine lines.
Melasma getting worse.

What not to assume

Brown skin not needing sunscreen is a myth.
SPF 50 does not mean all-day protection; the amount and reapplying matter most.
The small SPF in makeup or moisturiser is usually not enough, because no one applies that much of it.
Vitamin C is not a substitute for sunscreen.

Common mistakes

Applying too little; most people use a quarter to a half of what is needed.
Only on sunny days, or once before going out.
Missing the neck, ears and backs of the hands.
Lemon or toothpaste after sunburn.

General protection

Broad-spectrum SPF 30 or higher, PA+++ or higher.
About two finger-lengths for the face and neck (roughly one teaspoon).
Every 2 hours outdoors, and again after sweating or wiping.
Umbrella, hat, sunglasses, and seeking shade from 11 am to 3 pm.
Tinted (iron oxide) sunscreen if you have marks or melasma.

Ingredient evidence and limits

The core of protection is the sunscreen filter: mineral (zinc oxide, titanium dioxide) or chemical, both work when used properly. The word zinc causes confusion: zinc oxide in sunscreen and zinc PCA in acne products are not the same thing.

Vitamin C: can help as an antioxidant under sunscreen.
Niacinamide: helps uneven tone after sun somewhat.
Retinol: has evidence for the look of long-term sun damage; at night, slowly, not in pregnancy.

In a one-year study, daily sunscreen alone improved texture and tone.

When to see a dermatologist

Any new, changing or odd-looking spot.
Sunburn that does not settle in a few days, or covers a large area.
Rash or itch in the sun, especially after starting a medicine.

Simple routine

Morning

1
Gentle cleanser, or just water
If your face is not very oily after the night, water alone is fine in the morning.
2
Light moisturiser (gel or lotion)
Helps skin hold water; lighter textures feel better in the heat.
3
Sunscreen SPF 30+, PA+++; two finger-lengths
15 minutes before going out; every 2 hours while outdoors.

Evening

1
Gentle cleanser; two steps if you wore heavy sunscreen
Removes sunscreen and pollution.
2
Light moisturiser (gel or lotion)
Helps skin hold water; lighter textures feel better in the heat.

General education, not a diagnosis or treatment plan.

Questions people ask

Do I need sunscreen on cloudy days?

Yes. Clouds do not block a large share of UV. Even on cloudy monsoon days in Bangladesh, UV stays significant.

Do I need sunscreen indoors?

If you sit by a window for long, or have melasma, it can help, because UVA and visible light pass through glass. Deep indoors, the need is lower.

SPF 30 or 50?

Both are fine if you apply enough and reapply. SPF 50 blocks a little more, but that advantage disappears if you apply too little.

Check it against your own skin

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