I am 22 M. Feeling feverish from the past 10 days. And getting fever around 99.4F from the last week. Also i recently discovered a node has swelled up in groin area left side. Also having an abscess on left buttock which itself has ruptured and pus is draining. Also feeling slight congestion in throat. What's causing the fever and why node swelled up.I heard that low grade fevers could indicate something serious. Plz help i am worried. All my blood works (CBC,LFT,KFT, Thyroid, Blood sugar)were normal 1 month back.