Double agent: a congenital mole changing its identity

A 10-year-old boy presented with a congenital melanocytic naevus over the right face and neck showing gradual central lightening and surrounding depigmentation over one year. Examination revealed a 7 × 5 cm 2 hyperpigmented plaque with peripheral flat depigmenting areas, grey hair and perifollicular pigmentation. Dermoscopy demonstrated heterogeneous pigment with white structureless areas, while ultraviolet fluorescent dermoscopy highlighted sharp lesion margins. Findings suggested spontaneous regression of CMN with vitiligo-like depigmentation, likely due to immune-mediated melanocyte destruction. Recognition of this benign process is important to distinguish it from melanoma-associated regression and avoid unnecessary interventions, while ensuring appropriate clinical monitoring for atypical changes.