<prompt> Malignant transformation to melanoma is common in:March 2009Dermal nevusJunctional nevusCongenital nevusLentigo nevus  <response>: Ans. B: Junctional nevusIntradermal nevus: Benign; 1cm diameter, single, well-defined, circular, elevated, brown sometimes with black spotsa and nonulcerated.Junctional nevus: Premalignant: source for most malignant melanomas; looks like intradermal nevus but larger, often ulcerated, irregular border and heterogeneous coloration. Suspect melanoma if junctional nevus is getting darker or larger or bleeding or itching.Spitz nevusspindle and epithetliod cellnevus is a red-pink nodule; often confused with hemangioma clinicallyBlue nevus is black-blue nodule; often confused with melanoma clinically 