The sun is very important for the body, and even more so for sensitive skins.

Ultraviolet rays stimulate the synthesis of vitamin D in the body. The Sun helps osteogenesis  and acts beneficially on some forms of skin diseases such as atopic dermatitis and seborrheic dermatitis.
It is however very important to expose to the sun using precautions.
An incorrect exposure to the sun can be very harmful: just think that already after about 20/30 minutes the first damages to the skin can occur.
In order to reap the benefit of solar exposure just a short while is enough.
To help us understand how harmful ultraviolet radiation can be the UV index was created . It is a linear scale that shows  5 degrees of ultraviolet intensity: the higher the degree the   higher the chance that the solar radiation is causing damage to the skin and eyes. The UV index is issued every day and says what will be the intensity of the ultraviolet rays that day.
Particular attention should be paid to our skin type: our characteristics such as color of eyes, skin and hair determine the tendency to get burned. Skin types are 6:

1: blond or red hair, blue, grey or green eyes, pale complexion: extremely sensitive to sunlight, tends to get burnt without getting tanned.
2: blond or light brown hair , hazel or light brown eyes , fair complexion: sensitive to the sun, burns with ease and tanning is difficult.
3: brown hair, dark brown  eyes , brown complexion: may get burned at times.
4: hair dark brown or black, Brownish black  eyes, olive complexion: gets burned infrequently and tans with ease.
5: black hair, dark eyes, brown complexion: tans intensely.
6: hair, dark eyes, black complexion, black ethnicity: does not get burnt ever.