Journal of Asia Pacific Aesthetic Sciences

Abstract: Acquired bilateral nevus of Ota-like macules (ABNOM), also known as Hori nevus, is a common form of acquired dermal facial melanocytosis, particularly among individuals with darker skin tones, especially Asian women. We present the case of a 40-year-old single woman with Fitzpatrick skin type IV who had experienced hyperpigmentation over the bilateral temporal and infraorbital regions for the past 10 years. A diagnosis of ABNOM was made based on clinical presentation. The patient underwent a total of 17 treatment sessions over a period of two years and seven months, utilizing a combination of 1064 nm Q-switched (QS) Nd:YAG laser and 595 nm pulsed-dye laser (PDL), administered at intervals of one to two months. Pre- and post-treatment photographs were visually evaluated to assess outcomes. The treatment yielded favorable results, with gradual lightening of the pigmentation over multiple sessions. No severe side effects, such as post-inflammatory hyperpigmentation (PIH), were observed. The patient reported only mild pricking pain during each session of QS Nd:YAG laser and PDL treatment. In conclusion, the combination of 1064 nm QS Nd:YAG laser and 595 nm PDL may serve as a promising treatment modality for ABNOM. Future studies with larger sample sizes and objective assessment tools are warranted to validate and optimize this treatment approach.

Keywords: ABNOM, Q-switched Nd:YAG 1064nm, 595 nm Pulsed-dye laser, Post-inflammatory hyperpigmentation