Hi,
Thank you for your query,
Rash usually develops after MMR
vaccination after 1 week to 10days of vaccination associated with mild decrease in appetite.
For rash you can apply the
calamine lotion externally and if there is itching you can give oral antihistamine in prescribed dosage.
Usually the appetite will come back in 1 to 2 weeks but if the child is still having the rash with decreased oral intake consult your
Pediatrician.
Hope I have answered your query.