“Five serious sunburns increase the risk of deadly skin cancer by 80%,” The Daily Telegraph reports. A US study has found that sun overexposure during the teenage years  significantly increases the risk of developing skin cancer in later life. The study followed over 110,000 nurses over 20 years, using questionnaires.It found that women who had five sunburn-aor more blistering sunburns between the ages of 15 and 20, compared to those that had none, were 80% more likely to develop melanoma (the most aggressive form of skin cancer). Other risk factors included red hair color, high sunburn reaction as a child/adolescent and sun bed use – all of which were found to be associated with an increased risk of all three types of skin cancer. (Source)