Inherited dysplastic nevus syndrome is an autosomal dominant hereditary condition. A type of melanocytic nevus, it affects the epidermis and dermis. The main histologic differential diagnoses are pigmented spindle cell nevus and malignant melanoma. A Spitz nevus is a benign skin lesion. Hereditary causes of sebaceous cysts include Gardner's syndrome and basal cell nevus syndrome. Often, this disease evolves from a precursor lesion, usually a dysplastic nevus. The diagnosis of dysplastic nevus syndrome is based on clinical presentation and family history. Blue nevus, junctional nevus and compound nevus. Ruah has a distinguishable birthmark in her right eye, called the nevus of Ota. The cause as to why blue rubber bleb nevus syndrome occurs is currently unknown. Most patients with nevus depigmentosus do not pursue treatment for their lesion. Dysplastic nevus syndrome is inherited in an autosomal dominant manner. For the congenital nevus, the neval cells are found deeper into the dermis. Many sources classify Proteus syndrome to be a type of nevus syndrome.