It is most unusual for children to get Rubella at his age. Also he has probably been immunised against Rubella if he has had the MMR vaccination. He probably has an illness called Roseola or 'baby measles' which is common at this age. The rash usualy disappears after a day or two. Do not give him Prohist as this medicine will make him drowsy and very unhappy-it is an old fashioned antihistamine and has no place in treating Roseola.
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