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Department of Plastic Surgery, Kagawa Medical School, Kagawa, Japan.
Thirty-seven patients with nevus Ota were treated by skin abrasion-carbon dioxide snow therapy. Data obtained from 24 patients (including 5 infants) who completed treatment were analyzed to determine the number of treatment courses and to assess the outcome by color and histologic type. The 5 infants completing treatment received a mean of 10 courses of carbon dioxide snow therapy. Excluding these infants, the mean number of treatment courses was 3 for skin abrasion and 16 for carbon dioxide snow therapy. The therapeutic outcome was satisfactory, being graded as "excellent" in 6 patients, "excellent to good" in 6 patients, "good" in 10 Patients, and "fair" in 2 patients. None of the patients had a "poor" outcome. Darker lesions were generally less responsive to treatment. Lesions with melanocytes in the superficial dermis showed a better response with fewer courses of treatment. Those with melanocytes throughout the whole dermis generally had a poorer outcome. The results confirm that the benefits of this procedure are limited by the associated pain and the need for great skill and a long treatment duration.
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