[Physiology of the pilosebaceous follicle].

The human pilosebaceous follicle shows an extreme diversity with regard both its variation according to its localisation along the human body, and the various physiological dependences of the two tissues which comprise the pilosebaceous follicle. These latter, highly differentiated toward specialised synthesis (proteins, lipids) have their own specific physiology which, though, responds to some common mediators. Each pilosebaceous follicle shows specific cycles and regulation, irrespective with those of its "neighbour". Despite such a complex situation, the most common features of these two tissues, as well as their endogenous and exogenous consequences, are described.