[Pyoderma gangrenosum--an interdisciplinary diagnostic problem].

Pyoderma gangrenosum is a rare, chronic, progressive and noninfectious necrosis of skin with an unclear etiology. It usually coexists with the systemic disorders. Clinically it appears as a rapidly spreading ulceration in a various location.

Dermatitis artefacta in a patient with paranoid syndrome.

It is well recognized that psychosomatic factors play an important role in many skin diseases. Dermatitis artefacta coexists with quite an extensive number of psychopathologic conditions. In women, it is regarded as a ''cry for help'', especially when the patient is faced with psychosocial stressors.