Diagnosis:

Halo naevus (Sutton naevus)

Comments:

HALO NAEVI:

• Densely cellular lesion, predominantly dermal, symmetrical, with regular appearance
• Naevus cells and predominantly lymphocytic round-cell infiltrate closely intermingled
• No variations in cellularity of the inflammatory response
• No areas of fibrosis alternating with active inflammation
• No compact nodules of melanocytes devoid of inflammatory infiltrate
• No high-grade atypia of melanocytes, or abrupt changes in cell type from area to area
• A few mitotic figures commonly present
• Usually adolescent or young adult, presenting with change (growth; itching; erythema) in / around previously stable mole
• Halo of depigmentation around the lesion has usually not yet developed at this early stage