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Background. Hori's nevus is an acquired pigmented lesion involving bilateral blue-brown facial macules. There has been a dearth of reported treatment modalities for this condition.

Objective. The purpose of this study was to evaluate the efficacy of the Q-switched Nd:YAG laser for the treatment of Hori's nevus.

Methods. The Q-switched Nd:YAG laser was used to treat Hori's nevus in 66 Asian patients. Patients were treated up to seven times. The follow-up time after the final treatment ranged from 3 to 44 months.

Results. Twenty six percent of patients showed good to excellent clearing after one to two treatments. Fifty percent of patients who underwent more than two treatments received good to excellent results.

Conclusion. The Q-switched Nd:YAG laser can be used to treat Hori's nevus. Results are not as good as those seen with nevus of Ota.