Swollen gums on 15 month old?

My son is 15 months old. He had his MMR vaccine on April 1st. On April 6, he started running a high fever (mostly at night). His doctor told me to expect a reaction like that, so I alternated Tylenol and Motrin for the fever, gave him plenty of liquids, etc... After 4 days of this I took him back to the doctor (April 10). After looking him over his doctor said that both ears were slightly infected and that he had blisters in his throat. He did a blood test and said that judging by the results he suspected the blisters in his throat were caused by a virus (he didn't specify what virus, but did mention if he got a rash after the fever broke it was roseola). Well, the fever broke and there's been no rash, but his gums are unbelievably swollen. After doing some reading I suspected it was gingivostomatitis, but there are no blisters on his hands or feet. This is the only symptom he has, but his gums have been so swollen that they almost cover his teeth and they have been bleeding....

Swollen gums on 15 month old?
Please call your doctor, that's really weird. Don't take any chances with your little one!
Reply:All you can really do is continue the current medication and wait it out. Stop reading WebMD, it just makes it worse.
Reply:the same thing happened to my bother in preschool and he cryed and cryed and cryed and it went away in about a week! so since he is younger much younger than my brother he will probably get over it very soon in like 2 weeks! he will be fine and good judgement on the liqid food but dont give him any hot liquids! good luck!
Reply:take him to another dr. immediately. sounds like he had a reaction to the shot and your dr. amy have either mixed the shot wrong or gave it to him wrong. Just be careful and let me know how it goes. God Bless your Kid.
Reply:continue the advil and water. follow up with the dentist.