Dermatology Book

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MoleAka: Dermal Nevus, Junctional Nevus, Melanocytic Nevus, Nevocellular Nevus

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  1. Epidemiology
    1. Common Incidence in Caucasian skin
      1. Typical Caucasian adults have 20 nevi
    2. Less common in pigmented skin (e.g. Black)
  2. Classification
    1. Junctional Melanocytic Nevus
      1. Cells at dermoepidermal junction
    2. Dermal Melanocytic Nevus
      1. Cells limited to Dermis
    3. Compound Melanocytic Nevus
      1. Combined features of Dermal and Junctional Nevi
  3. Signs
    1. General characteristics
      1. Small (< 1 cm)
      2. Sharply circumscribed
      3. Soft, round or oval Macules or dome shaped Papules
    2. Junctional Nevus Characteristics
      1. Minimally raised Papule or flat Macule
      2. Smooth regular borders
      3. Tan, brown or dark brown color
      4. Distribution
        1. Palms and soles
        2. Trunk
        3. Face
        4. Upper extremities
        5. Lower extremities
    3. Dermal Nevus
      1. Skin-colored, tan or brown colored Papules
      2. Round, dome-shaped, well circumscribed Papules
      3. Distribution
        1. Most common: Face and neck
        2. Other locations: Trunk, extremities
  4. Differential Diagnosis
    1. Junctional Nevus larger than 1 cm
      1. Congenital Nevus
      2. Dysplastic Nevus
    2. Dermal Nevus
      1. Basal Cell Carcinoma
      2. Dysplastic Nevus
  5. Management
    1. See Atypical Nevus

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