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Published on: 7/4/2025

What might cause my nails to become discolored and black?

Black discoloration of nails can be due to a condition called melanonychia, which involves dark streaks in the nails and can be caused by various factors, including injury or certain medical conditions.

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Explanation

Melanonychia is a condition where the nails develop dark streaks or become discolored. This can happen for several reasons:

  1. Injury: Sometimes, an injury to the nail can cause bleeding under the nail, leading to a black appearance.

  2. Medical Conditions: Some health issues, like fungal infections or certain skin conditions, can also cause nails to change color.

  3. Medications: Certain medications might affect nail color as a side effect.

  4. Melanonychia: This is a specific condition where there is increased pigment in the nail, often appearing as a dark streak. It can be due to benign causes or more serious concerns like melanoma.

If you notice changes in your nail color, especially if it's a new change, it's a good idea to consult a healthcare professional to determine the cause and get appropriate advice.

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