Dysplastic nevi are a precursor to melanoma. They have irregular, "dysplastic" borders. Remember the "B" in ABCD stands for irregular Borders. Nevus means mole.
acanthosis nigricans - Darkening of skin associated with Type II diabetes mellitus
basal cell carcinoma of skin - Rarely, if ever metastasizes. Commonly affects upper lip.
blue nevus - Blue-colored type of common mole. Benign.
pigmented seborrheic keratosis - "Stuck on" appearance. Mostly benign. Affects older people.
Familial dysplastic nevus syndrome is inherited AD and characterized by tons of dysplastic nevi with transformation to malignant melanoma.
ok but why is blue nevi wrong? i thought q asks lession in both exposed and unexposed areas.