Glossary

Sebaceous glands are small pockets appended to the hair follicle. They produce sebum (fatty acids + triglycerides + cholesterol) that is discharged on the surface of the skin to mix with sweat and constitute our hydro lipid film. They are found particularly on the face, neck, shoulders, neckline and upper back. Secretion depends on hormones, in particular testosterone. It varies with the seasons, lessening in winter and with age, the secretion peaks between puberty and 50 years of age.