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A member asked:
35 yof extensive medical history have a growing vertical black line on my right thumb. noticed about a month ago getting longer and darker...what is?
A doctor has provided 1 answer
Black line on thumb: this needs a visit to your dermatologist. Is it on your nail, does it involve your cuticle, is it horizontal or vertical? All of these questions need answers.
Answered 2/20/2015
3.4k views
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