 [ Symptoms ] i presented with pain that started in my shoulder and then progressively worked its way down my arm [ Disease ] i can not see the rash to offer you a patient specific answer but those one year old vaccines are live vaccines with a two week incubation period so it is common for the chicken pox and the measles mumps rubella mmr vaccine to cause a mild rash if this is related to the vaccine then there is really nothing that needs to be done it will resolve on its own in a few days keep in mind however that there are hundreds of other things that can cause a rash