[Plica polonica].

The author summarizes the essentials and history of the plica polonica disease and describes some of his own experiences in diagnosis and treatment. It is remarkable, that the monographs of the internal medicine and the hungarian monographs of dermatology, with the exception of two, didn't even mention this phenomenon in this century. Besides, no original publications can be found in the hungarian medical literature about this topic. However we can find people with this syndrome in Hungary also at the present time. It can be connected with the increasing ageing and growing poverty in our country.