Fish pedicures, which involve tiny toothless carp nibbling away dead skin, could spread infection and disease, experts have warned. People with weak immune systems or conditions including diabetes and psoriasis, in particular, have been advised not to use it. The beauty craze using garra rufa fish has been banned in some US states. The Health Protection Agency yesterday issued new guidance after it found fish tank water with micro-organisms. "It's important that a thorough foot examination is performed to make sure there are no cuts, grazes or skin conditions that could spread infection," the Daily Express quoted Dr Hilary Kirkbride, from the HPA, as saying.