1. The total weight of skin accounts for 5% to 15% of body weight, with a total area of 1.5 to 2 square meters, and the thickness varies from 0.5 mm to 4 mm depending on people or parts.
2. Skin consists of epidermis, dermis and subcutaneous tissue, including accessory organs (sweat glands, sebaceous glands, nails and toenails) and blood vessels, lymphatic vessels, nerves and muscles.
3, neutral skin care: pay attention to cleaning, conditioning, moisturizing, massage week care.
4. Basal layer: composed of basal cells and melanocytes, with only 1 layer. It can produce melanin and protect the skin from ultraviolet rays. Cells have the ability to divide and proliferate.
5. The water content and oil content in the stratum corneum are related to the beauty of the face.