北醫美容中心主任 皮膚科張宜菁醫師部落格 I-Jing Chang MD Dermatologist Taipei
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12/7/2019 0 評論

全方位防曬-陽光不咬人 (本文已刊登於聯合新聞網)

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聯合新聞網本文連結:health.udn.com/health/story/6045/343151  

【聯合報/張宜菁/臺北醫學大學附設醫院皮膚科醫師】

防曬,對皮膚癌症、老化、黑斑、曬傷的預防,非常重要。面對琳琅滿目的產品,你怎樣選擇?

陽光中傷害皮膚的紫外線,依波長分成UVA(320~400奈米)與UVB (290~320奈米)兩種。UVA對皮膚的傷害不易察覺,卻可以導致皮膚老化與皮膚癌。因此,兼顧UVA與UVB的配方,已成為新時代防曬品的必備條件。

為提供正確訊息,最近美國FDA要求市面上防曬品標示,須符合三大規定︰(一)不准標示大於50以上的SPF數值,(二)標明紫外線UVA的防護力,(三)禁止包括「阻絕陽光」(Sunblock)、「防水」(Waterproof)、「防出汗」(Sweatproof),與「全日長效防護」(All-day-protection)等會誤導消費者的標示。


SPF係數越高越有效嗎?

防曬品包裝上的「SPF係數」,主要是對紫外線中「UVB」的保護力。UVB對肌膚的危害,最明顯的是曬傷,也可能致皮膚癌。SPF 30的防曬品過濾UVB的效果已經不錯,可濾掉日光裡97%的UVB;SPF 50則可濾掉98%的UVB。比SPF 50數值更高的防曬乳,效果增加有限,反而增加油膩感。競爭激烈的市場上,SPF數字年年攀高,曾有廠商甚至想推出三位數以上SPF的產品。為了導正觀念,FDA將禁止標示SPF 50以上的數值。

怎麼判斷防曬乳的UVA防護力? 

英、澳、日、美等國家,各有一套標準。經過漫長研究,美國FDA將採用四星級的標示。原則上,三顆星與四顆星的,保護力較足夠。台灣大多沿用日本的「PA值」標示。相較於FDA,「PA值」是直接在人體皮膚上測試所得,也值得參考。

哪些防曬成分能過濾掉UVA?目前已研發的,有氧化鋅、二氧化鈦,Avobenzone, Oxybenzone, Mexoryl, Helioplex等。


標示「阻絕陽光、防水、長效」的比較好嗎?

針對喜愛戶外運動的族群,許多產品標榜「防水」、「防出汗」,有些更強調可完全阻絕陽光(Sunblock)。部分消費者以為塗了這些強效防曬乳後,連續曬好幾個小時也安全無虞。

其實,防曬品很難完全防水、或是在皮膚上長時間不耗損、變質。若沒有定時補充防曬劑,等於容許紫外線直接傷害肌膚,相當危險。

有鑑於此,FDA才會禁止這些標示。出汗的季節,防曬乳容易脫落。進行水上活動時,陽光經由水的反射,能量會放大。在這些時刻,得更勤於補塗防曬乳。


全方位的防曬策略

依據美國皮膚科醫學會的指導方針,出門前半小時就要塗好防曬乳,每兩小時補塗一次。以台灣的日照量,我們需要SPF 30以上的防曬乳。若擔心擦防曬乳會長痘痘、困擾你上妝,可挑選標示不導致粉刺(Non-Comedogenic)、清爽型的配方。UVA能穿透玻璃,坐在窗邊或開車時,記得防曬。

防曬乳再好,都只能降低紫外線進去皮膚的量。想真正做好防曬,還是要減少肌膚暴露在陽光下的機會。比較實際的作法是,縮短上午10點到下午4點間的外出時間、走騎樓或樹蔭。撐洋傘、戴帽子,或運用專業的防曬衣物。
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預約張宜菁醫師美容醫學門診:(02) 6636-7135
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    醫美如何美感自然又安全,皮膚問題怎麼照顧,讓留學美國哈佛皮膚科的張宜菁醫師,提供您正確的醫療新知。
    預約美容醫學門診諮詢,請來電北醫美容醫學中心: (02)6636-7135, (02)27372181轉8215

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台北市信義區吳興街252號台北醫學大學附設醫院第3醫療大樓2樓皮膚科門診區

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淡水信義線-世貿101站 
步行10分鐘達本院
(桃園中正機場捷運可於北門站轉捷運淡水信義線)

板南線-市政府站 
搭北醫附設醫院接駁車到本院

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台北醫學大學站
1, 22, 33, 37, 226, 266,288, 承德幹線, 藍5 
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What Our Patients Are Saying
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"Dr. Chang is amazing at her work and was very attentive to my needs. I am from the United States, North Carolina, and I came to Taipei on a business trip with my husband. Dr. Chang was very informative and knowledgeable and explained everything to me in terms that I could understand. I met with Dr. Chang because of issues with fine lines and wrinkles, sun damage and an uneven skin tone. I received Fraxel Laser to my face and also Restylane injections to my chin, lips and under my eyes. I am extremely pleased with my results because they look very natural!! I would highly recommend Dr. Chang."

Theresa K.

I came across Dr I-Jing Chang's page on the Taiwan Medical University website by happy coincidence! I was looking for a good Taipei dermatology service that specialized in lip fillers, as that part of my face has lost volume as I have aged. I had a bad experience with lip filler some years ago in Taiwan at another clinic, and had since heard from other dermatologists here that fillers, especially for the lip, are not as common a procedure in TW as in the West. I had almost run out of hope that I could get a good treatment until I met Dr Chang.

From the first moment I met her, I had great confidence in her expert knowledge, her evaluation of my aesthetic needs and her true concern for patients. Now after having several treatments, including lip filler and Botox, my great first impression of Dr Chang has been more than confirmed. She is deeply knowledgeable about skin and aesthetic issues, and well trained in the US and in Taiwan. She is deeply empathetic, she is encouraging, she knows exactly what pain you might feel (and takes steps to minimize it), and she is an artist. She knows so much about what she is doing, and she truly cares about her patients.  The same goes for all her staff. The experience has been very positive, and I recommend her clinic very highly!
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Mary G.

Hello, I am a patient who is from California in the US. I have travelled to Taiwan for this particular skin treatment (fraxal) because the doctor is so amazing. In the past, I have tried so many luxury skincare lines, acid peels, microdermabrasion, and other such treatments for my acne and acne scarring. However, NONE of them can even compare to the wonderful effectiveness of this doctor. She has helped me so very much and I am extremely grateful. I cannot recommend her enough. She is the best and will give you the skin results you have always wanted. Definitely worth travelling around the world for! Book an appointment NOW!

Henry Hsu





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