Table of Content


Summer 2016, Vol. 24 No. 2

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

Review Article

Are sunscreens necessary in Hong Kong?


M Rademaker


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.


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