As summer approaches, you might be thinking about switching sunscreens—or finally starting to wear one again! But which sunscreen is right for your skin? And what ingredients should you be looking for? At Skindepth Dermatology, our expert team, led by Dr Alice Rudd, answers all your ‘burning’ questions.
Why do I need to wear sunscreen?
At Skindepth, we always say: sunscreen is your best daily skin insurance. Ultra Violet Radiation (UVR) from the sun causes skin cell damage—leading to everything from premature ageing to skin cancer. UVR includes both:
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UVA: A longer wavelength that penetrates deep into the skin, damaging collagen and elastin. This results in fine lines, sagging, and pigmentation.
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UVB: Responsible for sunburn and directly linked to skin cancer. It can damage DNA in skin cells, and if that damage isn’t repaired, it can lead to mutations and malignancies.
Daily sunscreen use helps prevent skin ageing and lowers the risk of skin cancers, including melanoma.
What does SPF really mean?
SPF (Sun Protection Factor) indicates the level of protection against UVB rays. You should always choose at least SPF 30+, preferably SPF 50+ for maximum protection.
But SPF doesn’t cover UVA rays. For full-spectrum protection, make sure your sunscreen has a high UVA rating—often represented by a star system. Check the label or speak to your dermatologist at Skindepth Dermatology in St Kilda East for advice on the best formulations.
What sunscreen is best for sensitive or rosacea-prone skin?
If you have rosacea or melasma, physical sunscreens are your best friend. Look for ingredients like:
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Zinc Oxide
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Titanium Dioxide
These are mineral (physical) blockers that reflect UV rays off the skin, rather than absorbing them. They’re perfect for sensitive skin types and conditions like rosacea, which can be aggravated by heat and UV exposure.
Patients at our Melbourne skin clinic often report reduced redness and pigment when switching to these physical blockers.
What should I use for swimming or working out?
If you’re heading to the beach or planning a workout, you’ll want a chemical sunscreen. These absorb into the skin and are water-resistant, making them more suitable for high-activity situations. Look for ingredients like:
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Oxybenzone
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Octocrylene
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4-Methylbenzylidene camphor
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Butyl methoxy dibenzoylmethane
Apply 20 minutes before swimming or exercise to allow absorption. Remember: physical sunscreens like zinc can rub off more easily during sweat or water exposure, so they’re not ideal in these cases.
Do I need sunscreen in winter or on cloudy days?
Absolutely. UV radiation is present year-round, rain or shine. It can penetrate clouds and glass (think office windows and car windshields), and is also emitted by fluorescent lights and computer screens. Over time, cumulative UV exposure can cause long-term skin damage—even when you don’t feel the sun.
So yes, sunscreen is a year-round habit.
When and how should I apply sunscreen?
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Apply after cleansing and moisturising, as the last step in your skincare routine.
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Use a generous amount and cover all exposed areas, including ears, neck, and hands.
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Apply 20 minutes before sun exposure.
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Reapply every two hours, or immediately after swimming or sweating.
Bonus: Tinted moisturisers or makeup with SPF are helpful—but they should only supplement, not replace, your primary sunscreen.
Can sunscreen cause vitamin D deficiency?
Not likely. While sunscreens block UVB (which your skin needs to produce vitamin D), even SPF 50 allows 2-7% of UVB rays through. That’s often enough for most people to maintain healthy vitamin D levels.
Vitamin D production can also be influenced by:
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Location (further from the equator = less UVB)
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Skin colour (darker skin needs more UV exposure)
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Time spent outdoors
Still unsure? Let’s talk.
If you have more questions, or want personalised sunscreen advice, book a cosmetic consultation at Skindepth Dermatology in St Kilda East. Dr Alice Rudd and her experienced team are here to help protect and preserve your skin health—whatever the season.
📞 Call us on 9527 4209
