What are the differences between tinea versicolor and vitiligo?

The differences between pityriasis versicolor and vitiligo are mainly reflected in the following aspects: 1. **Different causes**: Pityriasis versicolor, also known as tinea versicolor, is a fungal infection caused by Malassezia infection of the epidermal stratum corneum; vitiligo, on the other hand, is an autoimmune disease resulting from the destruction, loss, reduction, or dysfunction of melanocytes, leading to skin depigmentation. 2. **Different symptoms**: Pityriasis versicolor primarily presents as patches of skin with varying colors such as light brown, grayish, or pale yellowish-brown, possibly accompanied by fine scaling and mild itching; vitiligo presents as irregularly shaped white patches with clear borders, smooth surfaces, no scaling, and may be accompanied by whitening of hair. 3. **Different affected areas**: Pityriasis versicolor commonly occurs in areas with excessive sebum secretion, such as the chest, back, upper arms, and armpits; vitiligo has a wider distribution and is commonly seen on the face, hands, feet, genital areas, and may exhibit symmetrical distribution. 4. **Different treatments**: Pityriasis versicolor is mainly treated with topical antifungal medications, such as clotrimazole cream; vitiligo treatment options include medication, phototherapy, or surgical interventions depending on the severity of the condition.