How do i get rid of heat rashes on my face?

I live on a hot island and everytime i sweat these tiny white rashes start popping out all over my face. Whenever I wash my face after sweating it lessens but it never goes away. Is there anything I can do to get rid of them once and for all?
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3 answers so far

using enough moisturizer, sunscreen both in cold and in heat. Rinse with cold water every day before sleeping and waking.
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Jane Iredale has a great powder sunblock that will absorb the sweat: Powder Me SPF. Also, wipe your face with Witch Hazel several times a day. This should help a lot.
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Start using anti-wrinkle cream and spf 50+ sun cream and any other skin/face extras to boost the skin,should go if you keep using for a few weeks or so;)
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