RESUMEN
Pregnancy is a period of endocrinologic, immunological, metabolic and vascular changes during which various cutaneous alterations can be observed. If the physiological modifications are easy to recognize, the diagnosis of pregnancy specific dermatosis are more difficult. Through a correct classification that rests on the exam of elementary lesion, the diagnosis is possible. In case of pruriginous dermatoses, a hepatic check-up including liver enzymes and serum biliary acids must be systematic. The cutaneous biopsy with direct immunofluorescence exam will be done if pemphigoid gestationis is suspected. The treatment remains symptomatic and rests on antipruriginous drugs, dermatotropic corticoids and sometimes cures of corticoids per os. The maternal prognosis is often good. The fetal prognosis is bad in case of high biliary acids level as well as in papulous dermatosis