II. Causes

  1. Excessive Melanin deposition: Addison's Disease
  2. Excessive Melanocytes: Phototoxic Drug Reaction

III. Signs

  1. Diffuse brown discoloration of skin
  2. Oral Mucosa pigmentation
  3. Accentuated areas
    1. Palmar creases
    2. Recent scars
    3. Pressure points at elbow, knee, and knuckles

IV. Differential Diagnosis

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