Ask the Expert | 藥妝百科
![Ask the Expert](https://i.imgur.com/MEXDLMW.jpg)
![Ask the Expert](https://i.imgur.com/MEXDLMW.jpg)
A. I wish I had a short, simple answer to this question, but it is a little complicated. As a dermatologist and photobiologist[1], I have studied the damaging effects of the sun’s ultraviolet (UV) radiation[2] on skin, as well as how to protect against them. So I can walk you through a few important points that will make you more of a sun protection expert, too!
Ultraviolet light is invisible to humans, because it has shorter wavelengths than the light we can see. Within the UV spectrum[3], there are two types of rays that can damage the DNA in your skin cells and lead to skin cancer. It’s important to protect your skin from both types:
UVB rays cause sunburn[4] and play a key role in developing skin cancer. A sunscr...Ask the Expert | 藥妝百科
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