It doesn t help cystic acne or hormonal variants and comedonal clogged pore acne. At home blue light therapy devices generally require sessions of around 10 15 minutes twice a day for maximum results. Blue Light Kills Acne And Tightens Skin Bluelight Acne Skin On a petri dish three exposures to blue light kill about 99 99 of acne bacteria. Led blue light for acne . Protective safety glasses are recommended for using this. Chapas says led light therapy only works on inflammatory acne that show signs of inflamed red bumps and pustules. The science behind led acne treatments is that certain wavelengths of light specifically blue light are able to painlessly penetrate the layers of the skin and zap underlying acne causing bacteria that gets trapped in your pores. That is because blue light cannot reach very far into the skin and acne in deep pores or in cysts beneath skin are unaffected. These findings are naturally good news for many acne patients for whom conventional therap...