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Skin surface is covered with appropriate amount of sebum. However, if the excessive sebum secretion is clogged up in glandula sebacea outlet, fats pile up on the surface of skin and cause inflammation. This is acne.
The excessive sebum secretion is caused by the oily skin constitution, the excessive fat / sugar intake, or the mental stress. Moreover, if skin metabolism does not work right, old horns would be hard to come off to be the cause of clogging in glandula sebacea.
Unsuitable cosmetics or skin stimulation caused by hair and sweat also produce acne.

Even for the people with oily skin constitution, acne won't appear unless sebum excretion is blocked. It is important to activate skin metabolism and make old stiff cornified layer to come off easily.
It is also important to wash your face with medicated soap, to treat externally with horn softener and disinfectant, and to do dietary therapy.