<prompt> All of the statement regarding measles are true except-Rash appears first on legKoplik spot are seen on the buccal mucosaLong term complication may be seen in form of SSPECaused by RNA virus  <response>: Rash begins behind the ear and spread rapidly in a few hours over the face and neck, and extends down the body taking 2 to 3 days to progress to the lower extremities. Ref: PARK;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition , Page:148 