Diseases & Conditions > Cold Sore > Symptoms
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Symptoms of a Fever Blister   

The first indication a cold sore is developing will be tingling, burning or itching along the lips or inside the mouth.  A few days later an oral rash can develop.  This rash is followed by vesicles or blister containing a yellow fluid.  In some circumstances a fever will accompany a fever blister.  The blister will break open and ooze the yellow pus.  Eventually the sore dries up and develops a yellow scab. 

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