[Interrelations between environmental factors and skin].

The interrelations between environment-factors, especially microorganisms (fungi, bacteria and viruses) and human skin are discussed. Besides different local disturbances of the skin, the following ways of sensitisation are explained. It is pointed out that new drugs and/or substances must be tested before they can be used in human skin. The most frequent parasites and skin diseases caused by these and their epidemiological situations are mentioned.