Measles?

Can someone tell me what measles look like.
I doubt that DS has them but mum and i were talking about it the other day and we have know idea what it looks like. Is it a rash, or blisters like chicken pox or something completely different. And do they get really sick from it? and whats the treatment?

Im still fully b/fng him so i doubt he can get it but he has a rash over his head/chest and back. It looks just like a sweat rash and doesnt seem to be bothering him to much. He had a high fever a few nights before they came so thats why im wondering. He is still eating and drinking so id assume if he were sick he would go off food at least.

They dont look so bad today but ive noticed they are starting to come on his legs and arms now.