White patches on the waist are considered to be vitiligo, florid chaff rash, anemic nevus and so on. 1. Vitiligo: Vitiligo is the destruction of melanocytes in the skin, resulting in a lack of melanin in the skin causing white patches, which is an acquired disease, the main symptom is the appearance of white patches on the skin, which can appear in any part of the body. 2. maculopapular furuncle: the pathogen of maculopapular furuncle is Malassezia, when the body’s immunity is low, this fungus will proliferate on the skin surface, causing maculopapular furuncle, which mainly manifests itself as a pore-centered, well-defined punctate rash, and the lesions may be brown, light brown, or white. 3. Anemic nevus: Anemic nevus usually occurs at birth or during childhood, it is a congenital abnormality of vascular function, the main manifestation is that there will be pale colored spots, which may be round, ovoid, and usually increase gradually with the development of the body. White patches on the waist may also be other reasons, it is recommended to go to a regular hospital in time, by a specialist doctor to clarify the cause of the disease after standardized treatment.