Sunshine is awesome – it lightens the mood and (in moderation) helps your body produce vitamin D.
But as with almost any good thing, you can get too much sunshine. And that's not good for your skin.
UV rays from the sun are a form of radiation. Sunburn is thing that should give us a clear sign our skin doesn't handle overexposure very well. But smaller amounts of UV exposure over the long-term also add up. UV radiation weakens the skin's immune system, which can contribute to the development of melanoma and other types of skin cancer.