Sunscreen (also known as sunblock or suntan lotion) is a lotion,
spray or other topical product that absorbs or reflects the
sun's ultraviolet (UV) radiation and protects the skin.
Sunscreens contain one or more UV filters of which there are
three main types :  Medical organizations such as the American
Cancer Society recommend the use of sunscreen because it
prevents the squamous cell carcinoma and the basal cell
carcinoma. However, several epidemiological studies indicate an
increased risk of malignant melanoma for the sunscreen user.
Despite these studies no medical association has published
recommendations to not use sunblock. Different meta-analysis
publications have concluded that the evidence is not yet
sufficient to claim a positive correlation between sunscreen use
and malignant melanoma.   The dose used in FDA sunscreen testing
is 2 mg/cm² of exposed skin. Provided one assumes an "average"
adult build of height 5 ft 4 in (163 cm) and weight 150 lb
(68 kg) with a 32 in (82 cm) waist, that adult wear