7 month old with white spots on insides of lips?

I took my daughter to see her doctor yesterday because I noticed some white spots on the insides of her lips. They look like very tiny blisters and also like dry skin. The doctor took a look at it and said it may just be the weather but wants me to keep an eye on it for now. She doesn't seem too concerned about it but I am still trying to figure out what it could be. I agree with her that it MAY be the weather but at the same time I'm wondering if it could be from her pacifier? Within the past 3 weeks she's taken to her pacifier quite well, so well, she has to have it in her mouth almost constantly. Do you think this could be the culprit, or has anyone had any such experience? I've tried taking her paci from her but she will just start chewing on anything she finds (clothes, blankets, stuffed animals, toys) and get very fussy.