Photofacial is intense pulse light based therapy that targets colored structures in the skin called chromophores. The melanin in the skin is one of the chromophores that this treatment targets. So individuals with dark olive skin or darker present a challenge for these types of treatments. If the spots that need to be treated are significantly darker than the surrounding skin, it is often possible to selectively treat these even if the surrounding skin is olive.
However, there is a risk that over treatment can results in blistering and permanent skin discoloration. Energy setting need to adjusted very carefully. Accordingly, if the energy is too low, it is possible that the treatment will then be ineffective. If this is the case, the treatment will be ineffective. An ethical practitioner will be honest with you regarding the suitability of this treatment for your complexion.
Web reference: http://lidlift.com/foto-facial/