Halo nevus ndi nevus yomwe yazunguliridwa ndi mphete yopanda mtundu. Monga halo nevus ndizofunika zodzikongoletsera, palibe chithandizo chomwe chimafunikira nthawi zambiri, ndipo odwala sadzakhala ndi zizindikiro.

Ngakhale halo nevus ilibe vuto nthawi zambiri, ndikofunikira kuyang'anira chotupacho pafupipafupi. Ngati pali kusintha kwa mawonekedwe a chotupa kapena kugwirizana ndi ululu, dokotala ayenera kuonana mwamsanga kuti achotse kuthekera kwa melanoma.

Halo nevus akuti amapezeka pafupifupi 1% ya anthu onse, ndipo amapezeka kwambiri mwa anthu omwe ali ndi vitiligo, malignant melanoma, kapena Turner syndrome. Avereji ya zaka zoyamba ndi zaka zaunyamata wa munthu.