You slip into your bikini

Your skin is the colour it is because of melanin, pigment molecules produced by melanocyte cells in the basal layer of the epidermis. Melanin protects the cells in the epidermis by converting UV rays into heat. More melanin = darker skin = more natural sun protection.

The problem is that most of us don’t have enough for complete protection. Where there’s no melanin, UV rays almost instantly start to damage the DNA in your epidermis by interfering with its chemical structure.