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A whitish appearance on the tongue can be common symptom of many issues.
Your white tongue is apparently symptomatic of a more generalized underlying medical condition. There are multiple possible causes - most are bothersome, but not serious. Nevertheless, it is clear that, given your symptoms (including fever - fairly important), your underlying issue should be evaluated by your physician to definitively determine & treat the underlying cause. To clarify, while white-ish appearance ("pus-like") of the tongue can be indicative of many (mostly harmless) conditions, the fact that, in addition, you are running a fever, suggests that it would be wise to seek the advice and diagnosis and treatment of your physician. This is because you have an apparent generalized infection, whether a minor viral infection or something different - that should be treated.
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