皮肤会随着季节、年龄的变化,分泌量有所不同。譬如,夏天多,冬天就少。在年龄上,从青春期到二十几岁,分泌多,而三四十岁或年纪较大后会逐渐减少。一般人大致如此,所以原本皮脂量分泌就少的干性肌肤者情况更严重了,再加上水分及油分也不够,所以干性肌肤的人的角质层常呈起毛的状态。因此,外来的化学物质,很容易侵入皮肤的内层,而造成肌肤问题。从医学上来看,干性肌肤的人也比一般人还容易起红疹及皮肤过敏。肌肤如果过于干燥,很容易 Skin will change with the seasons, age, secretion varies. For example, summer and winter less. In age, from adolescence to twenties, the secretion of more, and three or four years old or older will gradually reduce. Most people are generally the case, so the original secretion of sebum less dry skin conditions are more serious, coupled with water and oil is not enough, so the dry skin of the human stratum corneum often lifted state. Therefore, foreign chemicals, it is easy to invade the inner layer of the skin, causing skin problems. From a medical point of view, people with dry skin are also more prone to rash and skin allergies than the average person. If the skin is too dry, it is easy