What does it mean if i have purple lines on fingernails?

Purple line on nail: Fingernails can have many different signs. Purple lines may represent a couple different things; mole/freckle at the nail base or splinter hemorrhage. The latter is not specific to any disease state, but may be a sign of something else that is going on. If you recently injured your nail bed, that might be a sign of bruising. http://en.wikipedia.org/wiki/splinter_hemorrhage.