It's not so easy to diagnose skin cancer sometimes but with a little training, and with the use of a dermatoscope, it becomes much easier to detect. Here in Australia of course we have the highest rate of skin cancer in the world and so people are much more aware of the risk and so the need to look at skin regularly. The downside is that many fair skinned individuals don't go out in the sun and so drop their Vitamin D levels which presents us with another set of potential problems. Regular screening is important and especially if the individual has a higher risk for skin cancer.
Comment on: Third of youngsters 'at risk from sun'
Probably the easiest way to ensure good Vit D levels is check your current levels and then take Vit D supplements as required / advised. It's really import ant to have good Vit D levels fora range of health reasons