Halo naevus denotes a pigmented naevus surrounded by a hypopigmented area. These are often multiple. The naevus in the middle may fade and disappear completely, and the surrounding pigment loss may be corrected. It the naevus looks innocent there is no need for removal. However, it should be kept in mind that the immune reaction caused by a melanoma may be visible as pigment loss around the tumour. Multiple halo naevi suddenly appearing in an elderly person warrant inspection of the whole skin: a melanoma may be found even elsewhere on the skin.