My 7 month old is teething & has had runny/stuffy nose for 2 days. now woke up with a red spot on his lip. is this a cold sore & how do i treat it?

Not likely: Cold sores appear after a primary infection with herpesvirus. This doesn't usually occur until toddlerhood. And it's quite a production fever sores drooling irritability. This sounds completely different. Have the pediatrician look at it if it concerns you.

Lip biting: Try ice on the lip. Try keeping a pacifiier in their mouth, childrens tylenol (acetaminophen) for the pain. Give them a product made for a baby to chew on insted of their lip. This will help push the teeth through the gums and less pain for baby . It is only a matterof time before they will get through teething.