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Can you tell me, for a fair-haired and fair-skinned person, what degree of protection to take 50spf or 90 at once for the first time?
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Besides that to take SPF50, there should be a mark broad-spectrum or it is specified PPD or PA. And also to ointment all not covered with clothes in sufficient quantity, and it is about 1 teaspoon on the face, a neck and ears, with renewal of means once in 2 hours. Also, don't forget to protect your lips, because in men without moustaches and women, this is a fairly common localization of squamous cell cancer.
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Can you imagine what an SPF 90 cream should be? The numbers, that's the level of sun absorption. Take 50, I'm being examined by a dermatologist and I'm strictly prohibited from sun exposure on my face. I have an SPF of 50.
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The largest number should always be taken.