that may resemble psoriasis or eczema as the rash progresses If left untreated, this can progress to tumors on the body, and other serious symptoms of cancer, including fever, fatigue, and vision ...
Is an infection 'going round'? Check if they've been in contact with another child with a contagious illness at nursery, school or elsewhere as this may give you a clue as to what the rash could be.