The Study of Dermoscopic Findings for Seborrheic Keratoses - A Morphological Study

초록

Backgrounds: Seborrheic keratosis is the one of the most common benign condition in Korean people, and should be distinguished from melanocytic pigmented skin lesions such as malignant melanoma, at the first level of dermoscopic examination. Object: To describe morphological features of seborrheic keratosis as seen by dermoscopy and to investigate their prevalence. Method: A total of 32 facial pigmented lesions, which were diagnosed pathologically as seborrheic keratoses, were collected. We described dermoscopic findings of them, such as milia-like cysts, comedo-like openings. Results: Nine morphological dermoscopic criteria were identified. Standard criteria such as milia-like cysts and comedo-like openings were found in many cases (22 and 21, respectively). Most of the lesions had sharply demarcated border (31), and some of them had moth-eaten appearance on the margins (14). We found pigment networks, which is known to be a characteristic finding of melanycytic skin lesions, to be present in 8 lesions. Using standard diagnostic criteria for seborrheic keratosis, 8 lesions would not have been diagnosed as such. Conclusions: The classic dermoscopic criteria for seborrheic keratosis (milia-like cysts and comedo-like openings) have a high prevalence, but the use of additional dermoscopic criteria such as cerebriform appearances, fingerprinting appearance, sharp demarcation, and moth-eaten borders may improve the diagnostic accuracy.