Dermal melanocytosis is characterized by the presence of ectopic melanocytes in the dermis. There are several clinical forms, such as blue nevus, mongolian spot, nevus of Ota, nevus of Ito and dermal melanocyte hamartoma. Differential diagnostic features of these dermal melanocytic lesions depend on onset, course, distribution and histologic feature. A 24-year-old woman presented with an asymptomatic 6x3.5cm bluish-to-grayish speckled patch on the left calf, which had been there since birth. Histopathologic findings, using Hematoxylin & eosin staining, revealed marked increase in the infiltrate of pigment cells mainly in the upper dermis. The patient was treated twice with a Q-switched Nd-YAG laser (Medlite Co., USA). Clinical improvement was observed. Herein, we report a case of dermal melanocyte hamartoma treated with a Q-switched Nd-YAG laser.
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