My son has had a cold since last Thursday. Kept him off last Friday as was clearly too ill to go. However come Monday he was active and himself so I sent him in. Today the nursery mentioned his nose was very bad snot wise. Again fine in himself. I feel.now that maybe I should keep him home? How long should a child have thick green snot? No temp or anything. He's had so much time off that I was worried about not sending him.but now I'm questioning myself... should he see a gp if it's not gone by now?