1, the skin structure has which three layers? A: dermis, epidermis, subcutaneous tissue 2, the epidermis can be divided into which 5 layers? A: the stratum corneum, the transparent layer, the granular layer, the spiny layer, the basal layer 3, what is the role of the stratum corneum? A: The stratum corneum has a protective function, waterproof, anti-bacterial effect. There are 6-10 layers of dead skin cells. 4. What is the role of the stratum lucidum? A: The role of the transparent layer is to control the skin moisture, prevent water loss and a lot of water into. 5. What is the role of the granular layer? A: The role of the granular layer is to prevent the intrusion of foreign bodies and filter ultraviolet light. 6. What is the role of sebaceous glands? A: The role of sebaceous glands is to secrete oil and moisturize the skin. 7. What is the role of sweat glands? A: The role of sweat glands is to sweat, regulate body temperature, excretion of waste. 8. What is the important part directly related to skin aging? By what fiber composition? A: and skin aging is directly related to the dermis, the dermis is composed of collagen fibers and elastic fibers. 9. What cells does the basal layer contain and what is its function? A: The basal layer contains melanin growth cells, and the way melanin accumulates determines the color of our skin. 10. With age, skin has a series of aging problems. What are the causes of skin roughness, dryness, dehydration and wrinkles? A: Roughness is due to the skin metabolism slows down, the stratum corneum accumulation caused by thickening, dryness, dehydration is due to the reduction of water content of the skin, water retention is reduced, wrinkles because of collagen fibers and elastin fibers slow down the rate of production, the formation of voids, coupled with the skin is dehydrated, wrinkles will be produced immediately. 11, in addition to age will affect the skin condition, what other factors will affect the skin health? A: There are hormonal changes, environmental pollution, ultraviolet radiation, dietary habits, sleep time and improper maintenance will affect the health of the skin. 12.What are the four basic types of skin? A: dry, neutral, oily, mixed 13, what are the characteristics of dry skin? What is the focus of maintenance? A: dry skin often feel tight, fine pores, eyes and neck easy to appear flaccid. Maintenance focus is to replenish moisture, reduce wrinkles and peeling phenomenon. 14. What are the characteristics of oily skin? What is the focus of maintenance? A: oily skin with large pores, excessive sebum secretion, prone to blisters, maintenance focus is to inhibit oil secretion, thoroughly remove excess oil and dirt in the pores. 15.What are the characteristics of normal skin? What is the focus of maintenance? A: Neutral skin texture smooth, soft, with a healthy glow, skin tissue fine, no large pores, no too greasy parts, maintenance focus is to maintain a balanced moisturizing, so that the skin texture can be more detailed. 16. What are the characteristics of combination skin? Maintenance focus is? A: Combination skin has oily nose and other T-zone areas, but the rest of the face is too dry. Maintenance focus is to inhibit T-zone oil secretion, astringent pores. 17, 5-step skin care are? A: clean, adjust the skin texture, toning, balanced moisturizing, protection 18, five fingers in the beauty refers to which two fingers? A: middle finger, ring finger 19, in the skin care when the correct gesture? A: We have to use the fingertips, along the natural growth direction of dermal fibers, from the inside out, gently press from bottom to top. 20.What is the role of the mask? A: The role of the mask is to condition the skin texture and gently remove the dirt deep in the pores, remove the old dead cells, the skin better absorption of nutrients in the mask. 21. What gestures should I pay attention to when applying the mask? What parts should be avoided? A: We use upward and outward gestures to apply the mask on the face, avoiding eye circles and lips. 22.What is the role of toning? A: The function of toning is to further clean the skin, remove the substances left inside the pores, and balance the PH value of the skin. 23. What is the role of balanced moisturizing? A: The role of balanced moisturizing is to adjust and soften the skin, help the skin to reach the best water-oil balance, and can avoid the loss of elasticity and moisture in the protective layer of the skin, so that the skin is moist and smooth, reducing fine lines and wrinkles. 24. What is the function of foundation? A: Foundation can protect the skin from dust and pollution and direct contact with the skin, can cover small defects, give the skin a smooth, even glow. 25, the method of using foundation is? A: The foundation is a small dot on all the bits of the face, and then slowly pat it away with your hands, paying attention to the articulation at the hair bun and the articulation of the jaw and neck. 26. What is the cause of melanin? A: When ultraviolet light reaches the inner epidermis through the cuticle of the skin’s most superficial layer, the tyrosinase enzyme in melanocytes will be activated to produce a large amount of melanin, thus causing the formation of pigmentation and causing uneven skin tone.