Greenish nail discoloration caused by a type of bacteria called pseudomonas.

Discolored Nails

What’s behind the color changes in your nails? About half of discolorations are caused by infection. Greenish nails may come from the pseudomonas bacteria, while red or black nails can result from a trauma to the nail. Yellow nail syndrome is a rare condition associated with lymphedema and lung diseases. Unsure what’s causing your discoloration? Time to get those nails checked!