Oily skin is explained by a excess sebum, called seborrhea. It manifests itself mainly on the face and upper back, and is characterized by:

• of the shines;
• a skin thick and dull;
• of the enlarged pores;
• the presence of numerous comedones, more commonly called black dots.

Skin can become oily for a variety of reasons, including:

• hormonal reasons;
• because of pollution;
• in times of stress;
• due to the use of excessively stripping cosmetic products.

With aging, oily skin generally presents few but deep and marked wrinkles.