My d.s. is 16 months and for the last 4 days has had horrible nappies, about 6 dirty nappies a day, but is teething and had a cold so thought nothing of it. He has bad nappy rash (unusual) which I am treating with Sudocreme but I have just found a small amount of blood in his nappy (about half teaspoon). Do I need to see a doctor urgently? Does anyone have experience of this? He is otherwise happy and behaving and eating as normal. TIA