[Idiopathic eruptive macular pigmentation following pityriasis rosea. Presentation of two cases (author's transl)].

We describe two cases of acquired hyperpigmented macular eruption following pityriasis rosea. This condition is characterized by an eruption of discrete grayish macules on the trunk. On the back, the lesion are oval and their long axis follows the cutaneous liners. Similar features have been described by Runtova. The clinical type of this pigmented eruption is quite comparable to the cases recently described by Degos, Civatte and Belaïch under the title of "idiopathic eruptive macular pigmentation". Sometimes the "idiopathic" character of this pigmented eruption may be lacking, when a retrospective diagnosis of lichen planus or pityriasis rosea can be made. We think that the pigmentogenes pityriasis rosea should be included in the group of atypical pityriasis rosea. A survey of the literature allows to recognize some identical cases formerly reported under various titles. All these cases should be grouped together under the title of pigmentogenes pityriasis rosea.