Causes Of Black Lines On Fingernails?

Illustration of Causes Of Black Lines On Fingernails?
Illustration: Causes Of Black Lines On Fingernails? Bing

Hello doctor, I’m Devanne, 13 years old.rnIt’s been a week since I had a black line on the fingernail of my right hand. Is it a symptom of a disease?rnPlease answer, thank you!

1 Answer:

Hi Valentine,


Thank you for asking HealthReplies.com.

If it is true that the black line on your fingernail has only appeared 1 week ago, then this condition may be caused by bleeding under the nail, or also known as a subungual hematoma. This bleeding is often triggered by mechanical injury, either consciously or unconsciously by the sufferer, for example due to bumping, pinching, and so on. Initially, the bleeding can make the underside of your nail reddish. Then, along with the body's mechanism to clot the blood to stop the bleeding, this reddish color will slowly turn bluish and then blackish.


In addition to a subungal hematoma, the black line on your fingernail may also be due to other causes, for example:


Melanonychia (dark lines due to genetic variation caused by excess melanin deposition under the nails)

Subungual melanoma (malignant skin tumor originating from melanocytes)
Fungal nail infection (usually characterized by brittle, easily cracked, uneven, and abnormally colored skin)
Vitamin B12 deficiency
Autoimmune disorders, such as SLE (systemic lupus erythematosus), psoriasis, and so on

So, you can see from our explanation above, your complaint can be a natural thing, but it can also be an indication of a disease. For this reason, it is recommended that you immediately check with your doctor for the complaints you are experiencing for further evaluation. If it is true that the complaint is due to a subungal hematoma, then depending on the severity, treatment can be done by observation or it is also necessary to remove the nail.


At this time, you should not over-press the black nail. Always keep your nails clean, by regularly bathing and washing your hands with antiseptic soap. Avoid biting your nails and limit excessive sun exposure (especially between 10 a.m. and 2 p.m.).


Hope it helps ya..

dr. Nadia Nurotul Fuadah

: by

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