B.C.
You bet they can! I've gotten them that way. Nothing is worse than a cold sore. If they do, check with your doc to make sure it's safe/ok, ( I don't know how old your kids are) but taking a few L-Lysine pills AS SOON as you feel that tingle will usually stop it dead in its tracks. All through my teenage years and still now I take 3 L-lysine pills 2x's the day I feel that notorious tingle start up.