๐ ็ธฝ็ฎ้ ๏ฝ ๐ ่ฑๆๅๆ๏ผๆฌ็ฏ๏ผ ๏ฝ ๐ ๅฎๆด็ฟป่ญฏ ๏ฝ โญ ็ฒพ่ฏ็ญ่จ
Blue and red light
Blue and red light
Studies have also addressed blue and red lightโs ability to improve acne lesions. The photochemical effect is a cascade of chemical reactions following the absorption of light into the chromophores that occurs without tissue destruction. In contrast, the photothermal effect aims to increase the chromophore temperature, with longer-energy exposures that cause cellular vaporization.
Blue light penetrates the skin to less than 100 microns, though at 407 to 420 nm, blue light also carries the strongest porphyrin photoexcitation coefficient. When the endogenous porphyrins in P. acnes absorb light at a specific wavelength, they initiate a phototoxic reaction to destroy the bacteria. This chemical process suggests that blue light carries the optimal wavelength to induce phototoxicity in P. acnes.31,32
Red light penetrates to the level of the sebaceous glands, and has a photothermal effect on sebaceous glands while also stimulating cytokine release from macrophages.33 The combination of both lights can be superior to the use of either alone due to the bactericidal effects of the blue light and the anti-inflammatory effects of red light.30