One of the most important functions of our skin is to protect our 'inside' the external environment, acting as a barrier and a filter between the "outside" and "inside." In addition, the skin is involved in regulating our body temperature, as when we have a fever or are physically working hard, we tend to sweat, which is the body's way to try and lower the temperature. Another important role of our skin to protect us from harmful substances entering our body, and the elimination of toxins. This has the burden on our liver and kidneys to filter the products of metabolism of our body. The skin also breathes! The hormones, sweat glands and glands of the pH of our skin pores are composed of a combination of oil and sweat glands (sebaceous glands and sweat glands) that help keep our skin healthy and elastic. An excessive sebum secretion is often associated with oily skin and acne.
This is particularly common in adolescents as the increased levels of sex hormones stimulate sebum production and secretion. When in balance, the combined excretion of oil and sweat from the pores of the skin has a pH of about 5.5. The acid mantle, the age and the pH of the skin is slightly acidic layer, also known as the "acid mantle" is the first body's defense mechanism against invading bacteria and is not a favorable environment for bacterial growth occur. This layer of defense becomes at puberty, so children are more susceptible to diseases, viruses and fungal infections are ringworm.