摘要： High-quality images are important for documentation, education and communication in dermatology. In tele-dermatology and artificial intelligence-based skin diagnostic system, the quality of images is crucial for accurate diagnosis. While various camera types are suitable for different clinical applications, smartphone cameras are improving dramatically and becoming more popular. As the resolution of the camera itself has improved, the quality of the light source has become the most important determinant of quality and consistent lighting is extremely important for before-and-after comparisons. Use of the built-in flash may lead to overexposure, intense surface reflections, blurring caused by failing of autofocus in the dark, and subtle changes during synchronization. Light-emitting diodes (LED) are now widely used by professional photographers and videographers and the images obtained with the LED light may be more reproducible than flash-assisted photographs. We evaluated the use of an LED pad (CN-luxpad23, Nanguan, China) for medical photography using different models of smartphones (iphone 7plus (Apple Inc., USA), iphone 6 plus (Apple Inc., USA), and HUAWEI mate10 pro (HUAWEI Inc., China)) in flash off mode, LED light intensity 40, color temperature 5600K (Figure 1). The technique was evaluated in 75 different lesions of 61 patients on the scalp, face, neck, trunk, extremities, palms and soles, intertriginous areas, genital and perianal areas, auricle and oral cavity in varying conditions of room light intensity. Three photos were taken for each lesion, using smartphone without built-in flashlight, with built-in flashlight and with “LED pad technique” respectively. The “LED pad technique” produced superior results in 90.67% (68/75) of the cases compared to using smartphone with or without built-in flash light regardless of ambient light (Figure 2). The remaining cases 9.33% (7/75) were on the scalp or face with too much reflection from sebum or whole body photographing needing a stronger light source. Advantages include low cost, ease of use and consistency of results for follow-up comparisons. Moreover, any LED panel with sufficient light intensity and a color temperature 5600K could be used in this way. The major limitation was lower intensity when the battery reaches a critical low level. Besides, a device to allow the LED panel and camera to be attached and allow two hands to hold the entire smartphone and shoot would be a valuable addition.