This discoloration could be small areas of bleeding under your nails, often called splinter hemorrhages. Because you are taking Acitrom (acenocoumarol) for your heart valve, your blood clots more slowly, making minor bleeding under the nails more common. While this is not usually an immediate emergency, it is very important to contact your doctor soon. They will likely want to check your blood clotting levels (INR) to ensure your Acitrom dose is perfectly balanced.
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Why are my fingernails turning black, is this a serious issue, and could it be related to my leaky heart valve or taking Acitrom 3mg?