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Male | 2

Black vertical line on the right thumb of 2 yrs old boy. Line is growing as nail grows. It started in sept 2020 and by Feb line covered full nail. No nail trauma or any history of such line in family.

1 Answer

Answered on 2nd Jan '23

It is possible that the black vertical line on the boy's thumb nail is a result of a melanonychia striata, which is a linear nail melanin pigmentation. It is relatively common in children and is generally harmless. However, it is important to have it evaluated by a doctor, especially if it is growing, to rule out any underlying medical conditions.

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