My son got a mmr vaccine 2 weeks ago. He is now developing a rash all kver his body is this normal? The rash is like little pimple like bumps

Rash. The rash you are describing is not the rash of measles, rather the rash of a viral exanthem which are very common in children this time of year, The treatment is nothing, as it will go away by itself. A child with measles is very ill with high fever, eye redness, cough, and diffuse morbilliform rash all over the body.