The difference between vitiligo and sweat patches mainly lies in the state of the rash, Wood’s lamp examination, skin CT and the results of fungal detection. 1. Rash status: Vitiligo’s rash is porcelain-white white patches with clear, smooth borders, and the surface of the rash is not covered with scales and has no itching, while sweat patches appear as pale white or brown patches, with scales covering the top of the rash and an itching sensation. 2. Wood’s lamp examination: vitiligo is gray-white or blue-white fluorescence, visible pigment islands or edge pigmentation. Sweat patches show yellowish or yellowish-brown fluorescence. 3. Skin CT performance: vitiligo CT shows basal cell pigmentation loss, while sweat patches have no similar CT performance. 4. Fungus test: Sweat patches are positive for fungus test, while vitiligo is negative. If there is any discomfort, it is recommended to consult a doctor in time and standardize the treatment.