What is the difference between vitiligo and pityriasis versicolor?

Vitiligo and pityriasis versicolor differ in several aspects: 1. Skin symptoms: Vitiligo manifests as white patches on the skin, varying in size and shape, with clear boundaries. After sun exposure, these patches may become red and accompanied by a burning sensation. In contrast, pityriasis versicolor appears as light brown or pale white spots with fine scales on the surface, indistinct borders, and typically round or oval shapes. The color of pityriasis versicolor does not change significantly after sun exposure. 2. Affected areas: Vitiligo occurs without specific patterns and can appear on any part of the body. Pityriasis versicolor primarily develops in areas rich in sebaceous glands, such as the neck, upper chest, and back. 3. Causes: Vitiligo is associated with multiple factors including genetics, autoimmune conditions, and neuro-psychological influences. Pityriasis versicolor, however, is mainly caused by fungal infection and is related to bodily organ function and immune status. 4. Treatment approaches: Vitiligo requires comprehensive treatment tailored to individual patients, such as medication and phototherapy. Pityriasis versicolor is primarily treated with antifungal drugs. In summary, vitiligo and pityriasis versicolor show clear differences in skin manifestations, affected sites, etiology, and treatment methods.