Can I sunbathe barefoot in hot weather?

More exposure to the sun can enhance bone calcium, but now the ultraviolet rays of the sun are relatively strong, and the characteristics of ultraviolet rays are: (1) Advantages: A, disinfection and sterilization; B, promoting bone development; C, it is good for blood color; D, occasionally can treat some skin diseases; E ultraviolet radiation directly affects the synthesis of vitamin d in human body, and there is not enough vitamin d without ultraviolet radiation; (2) Disadvantages: A, the skin is aging and wrinkled; B. producing spots; C, causing dermatitis; D, cause skin cancer, e, cause rough skin.