title: New insights into old common problems. II.
authors.affiliation: Ackerman Academy of Dermatopathology, New York, New York 10016, USA.
authors.forename: A B
authors.initials: AB
authors.lastname: Ackerman
authors.forename: J
authors.initials: J
authors.lastname: Mones
authors.forename: Y
authors.initials: Y
authors.lastname: Guo
mesh_terms: D003937:Diagnosis, Differential; D006801:Humans; D017492:Keratosis, Seborrheic / Q000473:pathology*; D007911:Lentigo / Q000473:pathology*; D008545:Melanoma / Q000473:pathology*; D009508:Nevus, Pigmented / Q000145:classification / Q000473:pathology*; D012878:Skin Neoplasms / Q000473:pathology*