 The study found that the incidence of post-inflammatory hyperpigmentation, pH, in Korean patients treated with Q-switched 532 nanometers ND, YAG, QS532NY, laser for solar lentigenes was 20.3%. The study also identified that patients with erythematous lentigenes, facial diffuse dyschromia, invisible pores and velvety skin were more likely to develop pH. However, age, sex, fit-spectric skin's phototype and season of treatment showed little association with pH. This article was authored by Hyun Jee Kang, Jung Im-N.A., Jong Hee Lee and others.