fish keeper's granuloma

an infection in humans with the bacteria causing fish tuberculosis (a Mycobacterium, but not the same as the one causing human tuberculosis). It is probably the only zoonosis of note to aquarists. It appears as a skin infection, usually on the hands or forearms where there was an earlier cut, and may be inflamed, suppurating, encrusting and irritated. Not usually serious unless the infected individual is already immuno-suppressed. Treatment requires antibiotics. Also called fishtank granuloma