FCT 2-2 : Treatment efficacy of 1064nm Q-switched Nd:YAG laser in ectopic Mongolian spot

Background: Q-switched neodymium-yttrium aluminium-garnet (Q-switched Nd:YAG) laser has been reported as effective treatment of nevus of Ota and acquired bilateral nevus of Ota-like macules. Data about ectopic Mongolian spot has rarely been reported. Objectives: To investigate treatment efficacy of 1064nm Q-switched Nd:YAG laser in ectopic Mongolian spot Methods: We included 62 patients with ectopic Mongolian spot and a total of 71 lesions were checked. 33 lesions were treated with 1064nm Q-switched Nd:YAG laser and 38 lesions were observed without treatment. The result was assessed by Mexameter and quintile grading scale. Results: Mean follow-up duration was 17.8±10.0 months in observation group and 14.1±6.8 months in treatment group. There was a statistically significant difference (p<0.001) in Δ melanin index (initial melanin index - final melanin index) between observation group (7.1±62.7) and treatment group (156.7±78.4). Mean quintile grading scale at final follow-up was also statistically different (p<0.001) between two groups (observation: 0.84±0.95, treatment: 2.82±1.01). Conclusion: Q-switched Nd:YAG laser is also effective in treating ectopic Mongolian spot not only in Ota’s nevus or Hori’s nevus.