Primary acquired melanosis (PAM) > flat, brown patches of pigment without cysts on the conjunctiva. Usually in middle age Caucasian pts. Unilateral and may become thickened overtime . 10 30% of these lesions convert Bowen's disease of the penile shaft presenting as a pigmented macule: dermoscopy, reflectance confocal microscopy and histopathological correlation Anais Brasileiros de Dermatologia a Melanoacanthoma of the upper labial mucosa. b Histopathologic Download Scientific Diagram Histopathology of Dermal Melanocytosis (Acquired Bilateral Nevus of Ota Like Macules (ABNOM) or Hori's Macules, Nevus of Ota, and Sun's Nevus)