My son is 5, he is autistic. He has had runny poo in his nappy one to two times per day for at least the last two weeks. He is non verbal and has a high pain threshold so doesn t really let me know if he is in pain. He seems ok in himself, eating not as much but drinking plenty and has good wet nappies. He developed a rash over the weekend over the top half of his face that looked like his head had been dipped in stinging nettles. It went away and the pharmacist recomended some piriton (antihistamine). It came back again the next day (yesterday) so I gave him some more. Now he also has impetigo. I ve put the cream on him. Why is he getting all this? Should I keep him off school? Should I take him for allergy testing?