Pityriasis versicolor

Pathology

Pityriasis versicolor, also called tinea versicolor, is a superficial cutaneous fungal infection caused by Malassezia furfur (formerly termed Pityrosporum ovale)

Features

most commonly affects trunk
patches may be hypopigmented, pink or brown (hence versicolor). May be more noticeable following a suntan
scale is common
mild pruritus

Predisposing factors

occurs in healthy individuals
immunosuppression
malnutrition
Cushing's

Management

topical antifungal. NICE Clinical Knowledge Summaries advise ketoconazole shampoo as this is more cost effective for large areas
if extensive disease or failure to respond to topical treatment then consider oral itraconazole