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Sunscreens come in many flavours. One of them is a zinc oxide sunscreen. In this video Dr Sirisha Singh (http://theskincentre.in/) explains what is a zinc oxide sunscreen and who should use it.
Basically a zinc oxide sunscreen uses zinc oxide as a physical barrier to protect skin against UV damage. This type of sunscreen is thick like a paste.
Kids with sensitive skin and people who have developed allergic reaction to chemical barrier sunscreens can use a zinc oxide or titanium dioxide sunscreens.
In some people a normal sunscreen causes the skin to tan. This is due to chemical reactions. Such people can also opt for a zinc oxide sunscreens.