I think my son, aged two, is allergy to polony. He has had diarrhoea on and off with what looked like blood and mucus, however every time we have it analysed they come up with nothing. We have noticed that when he eats polony about two hours later the diarrhoea is back with the ‘ blood’ in his stools. Do you think this is a food allergy, and if so to what? Second question, is this actually blood in his stool, because when it’ s analysed they can’ t seem to come up with anything.