Halo nevus is medically known as centrifugal acquired leukoplakia. At present, it is mostly believed that halo nevus is a kind of vitiligo, sometimes occurring at the same time with vitiligo. Halo nevus can occur at any age, mostly in young people, mostly on the trunk, especially on the back, occasionally on the head and face, and very rarely on the upper extremities. The rash is characterized by round or oval hypopigmented spots of varying sizes, centered on blotchy nevi. The halo nevus is uniform in color and can gradually increase in size to the size of a coin. The edges of halo nevi do not show deepening of pigmentation like vitiligo. The central nevus can fade or even flatten and gradually disappear, and its disappearance takes about a few months to 2-3 years.
Most halo nevi are centered on chromatophobic nevi, occasionally hairy nevi, blue nevi, fibromas, neurofibromas, or malignant melanomas.
If the vitiligo incidentally spreads around the nevus, it is called peri-nevus vitiligo, which is similar to halo nevus in form, but peri-nevus vitiligo occurs incidentally and there is deepening of pigment around the white spot.
The halo nevus is generally not recommended for surgical or laser removal of the middle nevus, but if the halo nevus is located in the neck, waist and other friction-prone parts can be considered for removal, and the timing of removal should not be chosen in the progressive stage of vitiligo. In addition, moles with the possibility of malignant transformation should be removed early.