APPARATUS AND METHOD FOR TREATMENT OF SKIN CONDITIONS USING LIGHT

摘要

A method and apparatus for improving the cosmetic appearance of a region of skin (11) affected by Acne Vulgaris, Rosacea or similar skin condition by means of directing light radiation (12) from an illuminating device (1) on to the skin (11). The apparatus (10) comprises a control unit (9) that operates one or more LEDs (7) (light emitting diodes) of the illuminating device (1). Each dose of light radiation (12) lasts for at least 100ms, during which time the skin 11 receives light energy from the LED(s) (7), which causes a photochemical reaction that stimulates the production of free radicals (singlet oxygen) that react with, and at least partially disable or destroy, bacteria that contribute to the symptoms of the skin condition. The light energy directed on to the skin (11) during any given period of 10µs is less than 0.5 Jcm <2>,< >and during any given period of 100ms is less than 5 Jcm<-2>. Substantially no beneficial photo-thermal reaction occurs within the skin (11). Light having wavelengths around 405nm and/or 585nm is used. The duration of a single dose may be much longer than 100ms and can last up to 10 hours (for overnight treatment).