After the use of vincristine cream, it is usually possible to see light. Most of the time, VITAMIN cream is used for acne, especially acne vulgaris, so VITAMIN cream should avoid sunlight as much as possible. Because there is ultraviolet light inside the sunlight, and the ultraviolet light irradiation of the drug component of the retinoic acid can easily lead to the decomposition of retinoic acid, thus causing a certain irritation of the skin reaction, resulting in a certain photosensitivity dermatitis. But the light inside the ultraviolet component is very small, so the general exposure to light is not harmful, and there is no obvious problem.