hi J.,
Sounds like Herpes Labialis,OR Coxackie Virus
My son had this( herpes labialis) and the doctor said it would last between a week to 10 days, and for me it lasted exactly 10 days,
This was not a reaction to the Chicken pox shot tho, its something they catch from outside , other children, ect.
Its a severe cold sore reaction, http://www.umm.edu/ency/article/000606.htm
NOW, I am personally not entirely sure thats accurate because
my oldest got herpes on his Cheek, and I am positive this was a reaction to the second chicken pox shot theyy receive at 11 years old.
http://www.understanding-herpes.com/?keywords=what+is+her...
And lastly Coxsackie virus, http://www.kidshealth.org/parent/infections/bacterial_vir...
Which I have an adult friend whom got this at the pool, you can get it from some one infected with it, or fecal matter on hands ect.. My baby also had this infection, he got it when he started crawling.
Hope these sites help
Good luck
hope the baby feels better, i know how horrible it can be.
M
EDIT: Just read the others comments,
I agree that most doctors DO NOT report these outbreaks, however it would be difficult to determine whether he contracted the virus or infection prior to the injection, Many of these viruses can remain dormant for up to 3 weeks,
ALSO you could have contracted it at teh doctors office from another infected child, who touched the door handle, or play things, ect..
Eg. I am a SAHM who would closely monitors her children,
i know that my child did not get Coxsackie from my home, However, we got to the super market, park, and for walks outside, Your sneakers can bring in THOUSANDS of germs, even if your hands are cleaned constantly, the mail man , garbage man, ANIMALS can all bring germs.
With my oldest son, who is 11 he is exposed at school, its difficult to monitor him there, he is exposed to a multitude of infectious material DAILY, Whats to say he didn't catch it from a friend at school without realizing he was infectious ect...
And the Herpes Labialis, for my started with swollen gums,
I waited 3 days thinking it could be coxsackie, and would get better, BUt it got worse, he was HOME for 2 weeks, we went NO where, HAD one playdate at our house, And went to the super market one time. I have no way of knowing how he got this infection, BUt I can tell you its horrible, and by tuesday of next week you should see improvement, If you haven't already please take the baby back to the doctors office.There isn't much they can do for her,it just needs to run its course.
VALTREX cream is for herpes which will be helpfull on the spots on the outside, so is herpecin.
I opted for the valtrex because I have 3 boys, and suspect i will eventually need it again, I prefer the good stuff.
Good luck
feel better
M