Objective      To describe the clinical feature and changing rules of patients with Ota’s nevus in Chongqing and its surrounding areas.       Methods      Four hundred and thirty-four patients with Ota’s nevus at an average age of 24 (74 males and 360 females) admitted to our hospital from January 2006 to January 2011 were included in this study. Their sex

age

onset age of disease

onset time of disease

color of skin lesion

distribution and size of skin lesions were analyzed.       Results      The male to female ratio was 1∶4.86. The incidence of acquired Ota’s nevus was about 54.61%. The occurrence of Ota’s nevus was peaked at the age of 3 to 5 in males and at the age of 5 years and 10 to 14 year in females. The percentage of patients with acquired disease and those with black skin lesions was significantly increased in resent years.       Conclusion      The incidence of congenital or acquired Ota’s nevus changes with its onset time in Chongqing and its surrounding areas. The color of skin lesion is related with the course of Ota’s nevus.