皮肤组织结构分析：D1至D14观察报告

During the period from D1 to D14, the cells in the normal control group were arranged neatly and tightly. The epidermal structure of the skin was complete and clear, with collagen fibers in the dermis layer densely and intricately arranged. The cytoplasm was uniformly stained red, and the structures of appendages such as hair follicles and sebaceous glands were intact. The subcutaneous fat layer and muscle layer structures were clearly visible, with fat cells and muscle fibers arranged neatly and densely, uniform in size, and with normal nuclear morphology.