Why do I have rough skin when others have silky smooth skin? This is a question that is often asked to me by beauty seekers. In fact, the fineness of the skin is determined by the texture of the skin and the size of the pores, and the skin varies greatly from race to race and from individual to individual. People with dry and normal skin tend to show fine texture and inconspicuous pores, while people with oily skin have a greasy appearance and large pores because of more sebum secretion, giving the appearance of unrefined, to use an internet phrase, unrefined. The skin has three main layers: epidermis, dermis, and subcutaneous tissue. The epidermis is the shallowest layer of the skin, which is very important from a cosmetic point of view, giving the skin texture and moisture, while the stratum corneum is the outermost layer of the epidermis. If we use the analogy of bricks and cement for the skin, then the bricks represent the keratinocytes and the cement is like the lipids that wrap around the keratinocytes and give protection, they form a protective barrier that prevents water from evaporating from the skin and the skin barrier function is intact to maintain a healthy epidermis. And the epidermis is healthy, the skin will look more delicate and smooth. To improve your skin, it is important to take care of it on a regular basis by paying attention to sun protection, maintaining the skin’s water-oil balance at all times, and enhancing moisturization. The water content of the stratum corneum of the skin is generally 20% to 30%. When the water content is lower than 10%, the stratum corneum will not be able to carry out normal metabolism and its function will be affected, and the skin will become rough and tight, with dry flaking and fine lines of dehydration. If the skin’s stratum corneum is full of water, the skin will only become soft and delicate and look transparent and shiny. In addition, oily and dehydrated skin is mostly due to more aging keratin, which can be properly exfoliated and replenished with moisture to improve the roughness of the skin. In addition, nowadays, medical aesthetic development is rapid, and there are many kinds of laser, injection and other cosmetic techniques can help improve rough skin.