Opinion please. Just wondering if you mums think that this could be a start of a cold sore? I have a feeling that it is…I recently had one two weeks ago but I have treating myself with cream and it has completely healed. Been avoiding kissing my son and husband but I’ve suddenly noticed my son’s lips all swollen up and something like a blister on his lips. Should I take him to nursery tomorrow? I’ve been told that children with cold sores can still attend school and nursery.