الفهرس 
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Abstract
Pityriasis versicolor disease is a chronic superficial fungal infection of the skin caused by the lipophilic yeast like fungus Malassezia . This organism is a saprophytic yeast that is a part of the normal skin flora. Malassezia (formerly known as Pityrosporum) is a genus of related fungi, classified as yeasts naturally found on the skin surfaces of many animals including human beings.The aim of this study was to assess the relative frequency of pityriasis versicolor infection among patients attended the dermatology and andrology outpatient clinic in Damanhour Educational Hospital, Damanhour city in El-Behira Governorate and to assess epidemiology and clinical features of this disease.This cross - sectional study was carried out on pityriasis versicolor patients who were selected from the first 10,000 patients attended the Dermatology and Andrology outpatient clinic of Damanhour Educational Hospital during a period of 6 months starting November 2017. All patients were subjected to detailed history taking and examination.The obtained data was tabulated and analyzed. The results of this study showed the following:1) The prevalence of pityriasis versicolor infection was found to be 4.2%, (420patients). 2)A higher incidence of PV in males (60.7%) was found compared to females (39.3%) and the most affected age group was between 20-29 years (44%). 3) Duration of the infection ranged between 1 month to 6 months in 45.2% of patients. 4)Recurrence was observed in 63.1% of patients.5) The trunk was the most common site (65%) to be involved. 6) Hypopigmentation was the most common color of the lesions.It was reported in 44% of patients.7) The majority of patients were from urban areas,70.2%.