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| Congenital |
| Freckle/ephelis |
| Racial/complexion melanosis |
| Acquired |
| Primary |
| Naevus |
| C-MIN or ‘PAM' with/without atypia |
| Secondary |
| Local disease, for example, sqaumous cell carcinoma |
| Systemic disease, for example, Addison's disease, ochronosis |
