The approaching spring and summer period is associated with the much-awaited improvement in the weather and increasing sunshine. The ultraviolet radiation emitted by the sun has a number of positive effects on the human body. The production of vitamin D intermediates in the skin is increased. Our mood improves, due to the increased synthesis of serotonin. However, we should also be aware of the negative effects of sunlight on our body. One of the most serious is the development of skin cancer, including the most dangerous of these, melanoma.