The skin’s pores are dilated and the skin is thicker. In the most severe cases, an oily coating is perceptible when touching the skin. Seborrhea on the scalp makes their hair greasy and sticky. They often tell me they have problems with their make-up.

I explain to my patients that skin always reacts in the opposite way to the way we want it to: the more vigorously they attempt to remove the sebum, the more skin will produce to replace it. It is therefore important to use products formulated for this skin type to avoid using anything too detersive. I often prescribe micellar water or cleansing milks that are rinsed off with water. The skin should be cleansedgently, in the evening.

However, oily skin often becomes flaky on the surface, sometimes causing seborrheic dermatitis in the centre of the face. Patients must use products specially formulated for this type of skin. I prescribe water-basedcosmetics, so as not to add oil to oil. I choose moisturising creams that mattify the skin to make it less shiny.