Anyone know what kind of rash my son has?

My son was with my ex wife's mom over the weekend and when she brought him back, he had this wierd blister like thing under his bottom lip. She said she thought it was a cold sore but it has been getting worse. I'm not sure if I should take him to the ER tonight or if its safe to wait until morning to go to the walk in. Here's a pic. http://imgur.com/a/cVF0S

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