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Image Number 941 (Pityriasis versicolor)


Diagnosis: Pityriasis versicolor

Site: Trunk

Sex: M

Age: 15

Type: Clinical

Description: Erythematous scaly patches

Submitted by: Nameer Al-Sudany

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Differential Diagnosis



A teenager presented with a slightly itchy reddish brown scaly patches mainly on the trunk of a sudden onset at the start of summer. The scaly nature of the rash was exaggerated on stretching the lesions between tow fingers. This is a case of pityriasis versicolor which is a chronic, often symptom-free or only slightly itchy fungal infection characterized by pigmentary changes. It is caused by overgrowth of the mycelial form of the commensal yeast Pityrosporum orbiculare and is particularly common in humid or tropical conditions. PV mainly affects young adults, appearing on the trunk, neck and proximal parts of the limbs and presents as brown or pinkish or hypopigmented oval or round scaly patches covered with branny scaling.  

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