Question:
Which of the following is NOT a nevus of melanocytic origin?
Which of the following is NOT a nevus of melanocytic origin?
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Becker nevus is an appendageal lesion with hair, not a melanocytic one.
Updated On: Jun 24, 2026
- Mongolian spot
- Nevus of Ito
- Nevus of Ota
- Becker nevus
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The Correct Option is D
Solution and Explanation
Step 1: Classify the lesions. Melanocytic nevi arise from melanocytes or their dermal/junctional collections. Recognised dermal melanocytoses include the Mongolian spot, nevus of Ito, and nevus of Ota, all of which represent entrapped dermal melanocytes producing blue-grey pigmentation.
Step 2: Identify the odd one out. Becker nevus is not a melanocytic nevus. It is an appendageal (epidermal/organoid) lesion characterised by a hyperpigmented patch with hypertrichosis and often a smooth muscle hamartoma component. Its colour comes from epidermal hyperpigmentation and basal layer changes rather than from a true melanocytic proliferation.
Step 3: Confirm the answer. Since Mongolian spot, nevus of Ito, and nevus of Ota are all melanocytic, while Becker nevus is appendageal, the lesion that is NOT a melanocyte nevus is Becker nevus.
Hence the correct answer is option 4.
Step 2: Identify the odd one out. Becker nevus is not a melanocytic nevus. It is an appendageal (epidermal/organoid) lesion characterised by a hyperpigmented patch with hypertrichosis and often a smooth muscle hamartoma component. Its colour comes from epidermal hyperpigmentation and basal layer changes rather than from a true melanocytic proliferation.
Step 3: Confirm the answer. Since Mongolian spot, nevus of Ito, and nevus of Ota are all melanocytic, while Becker nevus is appendageal, the lesion that is NOT a melanocyte nevus is Becker nevus.
Hence the correct answer is option 4.
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