could mean that you are getting poor blood circulation to that finger, if your other fingers start turning blue you need to get medical help soon, could be a symptom of heart problems, or lack of oxygen.One of my nails looks blue. could this be cyanosis?
if you have bumped or smashed your finger its just a bruse
and it normally doesnt go away for like 3 months
but if you cant think of anyway of how it got there, try pushing down on it, if it hurts its a bruse but if it doesnt and/or it seems to spread get immediate medical help it could be something serious
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