Why Sunscreen Still Matters Indoors: Dr Shirley Kwee Explains the Hidden Risks

Why Sunscreen Still Matters Indoors: Dr Shirley Kwee Explains the Hidden Risks

Adapted from a feature by Akshita Nanda, Correspondent of The Straits Times (12 November 2025)

We often associate sunscreen with beach days and outdoor activities — yet the reality is that skin damage can still happen indoors. From blue light emitted by digital screens to UV rays filtering through untreated windows, prolonged exposure may gradually weaken the skin barrier and accelerate ageing.

Invisible Exposure Indoors

According to Dr Shirley Kwee, aesthetic doctor and medical director at Cambridge Medical Group, UV radiation and blue light are part of daily life — even within the comfort of home or office.

“Some may assume that staying indoors offers total protection, but sunlight still penetrates buildings,” says Dr Kwee. “Fluorescent lighting also emits low-level heat and UV radiation that can accelerate skin ageing.”

She adds that there is also the unquantified risk of prolonged blue-light exposure from mobile phones, tablets, laptops, and digital screens — all of which contribute to oxidative stress on the skin.

Dr Kwee’s Practical Advice

To reduce the impact of blue light and indoor UV exposure, Dr Kwee recommends:

• Applying sunscreen daily, even when working indoors, with at least SPF 30.
• Reapplying every two hours if near windows or strong lighting.
• Using ceramide-based moisturisers to strengthen the skin barrier.
• Choosing antioxidant-rich products (with ingredients like vitamin C, vitamin E, or niacinamide) to neutralise oxidative stress.

“Even indoors, your skin is still exposed to UV and blue light — daily sunscreen is essential,” Dr Kwee reminds. 

A Holistic Approach

Other dermatologists quoted in the same report highlighted that healthy skin also depends on adequate rest, balanced nutrition, and mindful screen use.
Combining these habits with consistent sunscreen protection helps maintain long-term skin health and resilience.