Sun, in moderation, is good for our health but over-exposure to the sun’s rays can cause both short- and long-term skin damage. You can read about how the sun affects skin, both on the surface and at a cellular level, in How do UVA, UVB and HEVIS light rays affect skin?
Not all skin reacts in the same way to the sun. Our age as well as our skin type and condition can make us more sensitive to exposure. You can find out more in Sensitive skin: why does it need daily sun protection? and Why do babies and children need special sun protection?
The skin on some parts of the body is more sensitive to the sun, and more susceptible to sun damage, than skin in other areas. Facial and body skin have different needs when it comes to sun protection. Facial skin is thinner and, being mostly uncovered, is exposed to the sun on a daily basis. It needs dedicated sun protection and you can find out more in Why do I need daily sun protection for my face?
Body skin is thicker and, in general, is less exposed to the environment. There are, of course, some notable exceptions such as our hands, arms and décolleté and these areas need particular care. People who live in sunnier climates and/or people who spend a lot of time outdoors should also be mindful of how they protect their skin.
The sun also affects different skin types and conditions in different ways and you can read more about this in sensitive skin: why does it need daily sun protection?