Dermatology is an evolutionary branch of evolutionary, active in constant connection with other medical specialilties.

The observation of the skin, mucous membranes and appendages (nails, hair) is part of any clinical examination that the dermatologist will perform.

The skin is often a mirror of internal diseases. The early diagnosis of the skin, easily recognizible to the eyes of the dermatologist or by biopsy (analysis of the skin under a microscope) can often spare the patient further costly and uncomfortable investigation.

The skin is also directly related to the environment and a strong proportion of the cutaneous pathology is related to physical external aggressions (sun, cold) or chemical (cosmetics, pollution, etc.).

Examination of the skin by a specialist in dermatology will be beneficial to the patient, be it for one or more 'spots', or for symptoms implicating internal organs. For example, the early discovery of a black spot on the back and its rapid removal by the dermatologist can save a life. It is important therefore to never trivialize or ignore 'spots' on the skin, without previously showing them to the dermatologist.

Please note that part of the dermatology dedicated to technical actions is now called Dermato-surgery. This part is dedicated, amongst other things to the various surgical techniques for removal of a tumour and more complex reconstruction, lasers and injections.