I've been getting bumps on my hands after working in my tank. I went to a dermatologist and found out I have warts and granuloma annulare which look like a ring shaped bump, they are only on my hands so I'm pretty sure they are from the fish tank. Does anyone know what could be causing this, corals, live rock, fish? I now use 24" long gloves when working in my tank except when I am handling corals.