Hi bit worried as DD, 9, kissed DS, 5 months. I had no idea she had a coldsore until my other DD told me. She has had them before a few times ut this one muct have only just come up and is small and red. No-one else inc me have the sores. Should I be worried about this? I am scared DS will catch it and become ill. As far as I could tell she kissed him on the cheek, his had his dummy in.