RESUMO
Pityriasis versicolor is a frequent and common worldwide superficial dermatosis that can occur in all ages. The goal of this work is to show the important place that occupies the pityriasis among the superficial mycosis of skin and the scalp and to try to draw the profile and the features of this affection. To evaluate the prevalence of the pityrosporum we achieved a retrospective survey on a period of 13 years to the labotutory of Parasitologiy and Mycology of the children hospital in Rabat, The diagnosis was based on a direct microscopic exam of the squames coming from the lesions. Pityriasis versicolor was diagnosed among 1087 subjects [45, 15%of the dermatosis] and was located to the skin in 55, 47%tof cases A light feminine predominance is noted with 54, 93%. The age of predilection is between 16 tand 30 years representing 41, 98%of all cases. There iwas no meaningful variation according to the seasons. The pityriasis versicolor is a banal infection but is unaesthetic and poses a real problem for its treatment that is long and has frequent recurrences