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Regarding your question,

Treatment of black line in nail

It is common to complain of different nail problems like colored lines or other problems. Black lines in nail is one case which may attributed to other medical conditions thus i see the following

• If you complain of this problem sporadically without complaining of other problems, thus it is due to under nail hemorrhage which just need time to be relieved.
• If there are other symptoms it may related to other medical conditions like cardiac problems.
• It is better to seek for medical help to be sure about which point you have.

Causes of black lines in nail

There are causes like the following

• Trauma is the commonest cause
• endocarditis
• psoriasis
• Infections
• fungal infections
• Kidney, lung and other problems

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