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Summer 2016, Vol. 24 No. 2

Hong Kong J. Dermatol. Venereol. (2016) 24, 70-76


Review Article

Are sunscreens necessary in Hong Kong?

在香港生活有使用防曬產品的必要嗎?

M Rademaker

Abstract

Despite the relatively low-risk of skin cancer in Hong Kong (latitude 22°N), photo-protection remains an important health strategy to reduce photoaging and photo-immunosuppression. UVA, UVB and infrared wavelengths damage the skin through a variety of cellular and biochemical mechanisms. These can largely be mitigated by appropriate photoprotection: 1) minimising UV exposure, particular during summertime from 10.00 to 14.00 hours, 2) wearing appropriate clothing, hats and sunglasses, and 3) the effective use of sunscreens. A broad spectrum SPF50+ sunscreen should be applied daily, 30 minutes before going outdoors and re-applied immediately before going outside. The risk of vitamin D deficiency is not significantly increased with real-life sunscreen use.

儘管皮膚癌的風險在位處北緯22度的香港相對較低,但日光防護仍是一個不可忽略的個人健康策略,以減少光照引起的皮膚衰老及免疫抑制。長波紫外線(UVA)、中波紫外線(UVB)和紅外線的波長,可通過各種細胞和生化機制損傷皮膚。這些損害大體上都可通過適當的日光防護緩解,包括:1)盡量減少暴露在紫外線下的時間,尤其是在炎夏的上午十時至下午二時;2)穿著合適的衣服、帽子和太陽鏡及3)有效使用防曬產品。廣譜的SPF50+防曬產品可每天使用,應先在外出活動前三十分鐘塗上及出門時再塗一遍。防曬霜在日常生活中的實際使用,並不見有明顯增加維生素D缺乏的風險。

Keywords: Photo-immunosuppression, photoaging, photocarcinogenesis, photoprotection, UVA, UVB

關鍵詞: 光免疫抑制、光衰老、光致癌、光照保護、長波紫外線、中波紫外線