Case 5A Female, 1 ½ years. Recurrent papule, cheekShow diagnosis & comments
(Locally recurrent) Spitz naevus
Local recurrence of Spitz naevus can occur in the form of a single papule, or several such papules (agminated recurrent Spitz naevus). The diagnostic features of such a recurrent lesion are essentially the same as those of the initial lesion, but scarring may result in some architectural irregularity. Comparison with the original lesion is very helpful, and an immune stain such as S-100 or MART-1 (Melan-A) helps in reviewing the overall architecture, which in Spitz naevus tends to be very regular (see Case 5B), contrasting with most melanomas of similar thickness, which tend to show more variability in cellular features, arrangement of lesional cells, and reactive changes.