1. Tattoo.
  2. Ephelis/freckle.
  3. Oral melanotic macule.
  4. Nevus.
  5. Melanoma.
  6. Racial pigmentation.
  7. Addison’s disease.
  8. Medication melanosis.
  9. Peutz-Jeghers syndrome.
  10. Smoker’s melanosis.
  11. Heavy metal toxicosis.

By Infodrg