A definitive diagnosis of measles can be made mainly during the typical rash phase. In the early stages of measles sometimes a particularly clear diagnosis cannot be made, but it can still be suggestive. The fever is often accompanied by symptoms of upper respiratory tract infection, such as sneezing, runny nose or sore throat, but this is not particularly suggestive. What may be suggestive is the presence of conjunctivitis, which means that the patient’s eyes appear red and may have photophobia and tearing. The patient may also develop measles mucosal plaques 2-3 days after the fever, which appear on the buccal mucosa opposite the second molar and may appear as white dots, the size of a pinpoint, 0.5-1 mm in diameter, surrounded by a red halo. 1-2 days later, the measles mucosal plaques may fuse and form ulcers that resemble mouth sores, which may be suggestive.