How laser work on Acne
There are three stages of the acne formation in the skin. Excess oil (sebum) gets clogged in the pores, this then promotes the growth of a bacteria known as Propioni bacterium Acnes - P. acnes. This bacteria leads to the redness and inflammation, that associated with pimples.
The absorption of light lead to photo-activation of the Porphyrin, which is a chromophore that absorbs the light from the laser. This then causes the formation of a singlet oxygen within the bacteria that breaks down the propioni bacterium acne bacteria,therefore, clearing of the acne lesion.