With the number of sunscreens available it is difficult to work out which one is the best. According to her there are two basic types of sun protection creams — physical and chemical sun blocks. Physical sun blocks use either zinc or titanium oxide to reflect or scatter the UVA and UVB rays from the sun. However they may block our skin pores causing small papules to form. Chemical sun blocks contain several ingredients that absorb mainly UVB and seine UVA rays and prevent damage to the skin.
Another factor to study while buying a sunscreen lotion is the SPF written on the side of the bottle. The SPF or Sun Protection Factor is calculated by comparing the amount of time needed to produce sunburn on a protected skin to the amount of time needed to cause sunburn on unprotected skin.