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Dyspalstic Nevus – Histopathological Criteria (NIH).
| Major Criteria (mandatory) |
| Lentiginous or contiguous melanocytic hyperplasia |
| Focal melanocytic atypia |
| Minor Criteria (at least 2) |
| ‘Shoulder phenomenon' |
| Fusion of epithelial cones |
| Subepidermal concentric lamellar fibrosis |
| Superficial perivascular lymphocytic inflammatory infiltrate |
