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I'm a 20 year old Asian male. Three days ago, I noticed a single very faint brown line on my right index finger. Its width is probably 1 mm. Its very faint that when you look at it at different angles, it seems that it disappears. I also noticed a super slight ridge (I'm not sure how to call it) on top of this discoloration. However whenever I put a bright light underneath my index finger, I can't see any discoloration/dark spot/line both on the nail itself and the cuticle.
Just additional information, I'm skin type IV, no history of melanoma (or any other type of skin cancer) in the family that I know of, and currently it only appears on my index finger.
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