1. Non-melanocytic lesions
    1. Inflammatory
      1. Post-inflammatory hyperpigmentation
      2. Dermatofibroma
    2. Hamartomas
      1. Collagenous nevus, papillary dermal type
      2. Nevoid hyperkeratosis of the nipple
    3. Benign neoplasms
      1. Solar lentigo, including lichen planus-like keratosis
      2. Seborrheic keratosis
    4. Malignant neoplasms
      1. Basal cell carcinoma, pigmented
      2. Solar keratosis, pigmented
  2. Melanocytic lesions
    1. Benign
      1. Melanosis
      2. Simple lentigo
      3. Nevus of Ota, nevus of Ito
      4. Nevi
        1. Congenital
          1. Classic acral
          2. Superficial
          3. Superficial and “deep”
          4. Masson’s blue neuronevus
          5. Common blue (Jadassohn-Tieche)
          6. Combined
          7. Miescher’s
          8. Unna’s
          9. Nevus spilus
          10. Persistent
          11. Special site
          12. Yet to be classified
            1. Superficial congenital nevus, probable
        2. Acquired
          1. Clark’s
          2. Spitz’s
          3. Reed’s
          4. Yet to be classified
            1. Clark-like
            2. Spitz-like
            3. Reed-like
    2. Malignant
      1. Melanoma
        1. In situ
        2. No longer in situ (“invasive”)
        3. Persistent
        4. In association with a nevus
        5. Metastatic