What is pityriasis versicolor?
Recently, I noticed several light brown spots on my chest and back. They have fine scales on the surface, and become more noticeable after sweating. They are neither painful nor itchy. May I ask if this could be tinea versicolor?
Doctor's answer (1)
Pityriasis versicolor is a chronic superficial fungal skin disease caused by Malassezia fungi on the skin surface.
Malassezia is a normal commensal fungus on human skin. However, under conditions such as high temperature and humidity, excessive sweating, excessive sebum secretion, or compromised immune function, these fungi may abnormally proliferate, causing the skin to develop light white, brown, or pinkish round or oval patches, commonly seen on the chest, back, neck, and armpits.
It commonly affects the chest, back, armpits, neck, and abdomen of young and middle-aged adults, but may also involve other areas. The skin lesions initially appear as small spots, which may subsequently enlarge and merge. The color is mostly grayish, light brown, brown, or dark brown, with clear margins.
Treatment primarily involves topical antifungal medications such as ketoconazole and clotrimazole. In severe cases, oral antifungal drugs may be prescribed. It is important to maintain skin cleanliness in daily life, shower and change clothes frequently. Wear sweat-absorbing, breathable clothing, and avoid environments with high temperature and humidity. During treatment, follow medical instructions and complete the full course of treatment to prevent recurrence.
