... ,red,yellow ,blue 3 light with different usage. For acne,whiten &softens skin wrinkles,increase skin elasticit Pdt (led) ... violet blue light matches the peaks optical absorption of acne aminolevulinic acid (ALA), metabolites inside the porphyrin, ... Removes the dermal patches, freckles and chloasma. Treat cystic acne effectively with photosensitizer, actinic keratosis, Bowen's disease, ...