If you have fair skin, burn easily in the sun and have numerous freckles, you are more likely to develop skin cancer in adult life. It is important to know your skin type:
Skin type I always burns, never tans
Skin type II invariably burns, but can tan
Skin type III can burn, but tans easily
Skin type IV rarely burns, always tans
Despite what you read, and have been told, sun block preparations do not block out ALL ultraviolet light (UVL). They are effective in blocking out UVB (the burn ray), but not so effective in blocking out UVA (the tan, ageing ray).