Green nails
Encyclopedia
Green nails may be due to a Pseudomonas aeruginosa infection causing a green nail syndrome
or (2) the result of copper in tap water.
Green nail syndrome
Green nail syndrome occurs as a result of an infection with Pseudomonas aeruginosa, and may also occur as transverse green stripes that are ascribed to intermittent episodes of infection....
or (2) the result of copper in tap water.