Q-switched Ruby Laser Treatment for Nevus Ota

Abstract

We studied the effectiveness of the Q-switched ruby laser (QRL), RD-1200 (694nm, 20ns), Spectrum Corporation, by treating 86 cases of nevus Ota.
The results of the total 86 cass were excellent in 10 cases(12%), good in 64 cases (74%), fair in 5 cases(6%), poor in 7 cases(8%). Satisfactory results (excellent or good) were achieved in 86% of total cases. Those treated once or twice showed the less satisfactory results as fair and poor, while those treated more than three times showed the satisfactory results. No side effects, such as scar formation, abnormal hyper or hypopigmentation, was noted on any case.
Histological changes caused by laser irradiation were limited to that of melanosomes and melanin containing cells, other tissue being kept normal. In Practical irradiations no special skill was required, the post-operative treatment being simple. From these findings, it appeared that the QRL was highly effective and safe in the treatment of nevus Ota and repeated multiple treatments to the same site at regular intervals could attain high efficacy.