Diagnostic value of dermoscopy combined with reflectance confocal microscopy for clinically equivocal blue nevus

Blue nevus(BN)is a benign,acquired pigmented lesion characterized by a bluish or dark-bluish pigmentation.Most lesions are benign and stable over time,sometimes developing into malignant blue nevus(MBN),a variant of malignant melanoma.The prognosis in MBN is at least as serious as in conventional melanoma.[1]Additionally,a differential diagnosis of BN including nodular melanoma,pigmented basal cell carcinoma,and cutaneous metastasis of melanoma may lead to excessive surgical excisions.