severe dysplastic nevus melanomadysplastic nevus removal surgerylentiginous dysplastic nevusdysplastic nevus pathologysevere dysplastic nevusmoderate dysplastic nevusexcision of dysplastic nevusclarks dysplastic nevusdysplastic nevus molefamilial dysplastic nevus syndromeseverely dysplastic compound nevusdysplastic nevus with severe atypia