lymphomic nodes are there as 1st frontline against foreign virus invasion.

hence it will getting swollen for few days until the virus is successfully countered.

but if still swollen for a very long time, then it's time to visit doctor.

lymph nodes' locations = underarm, neck, genital, etc.

speedy recovery for chef wan

Bro lymphoma is one of the easiest cancers to treat.

So many people getting cancer now

Yes, exactly.

but if swollen,pain or even got feverish for more than a week, i suggest go to see doctor at clinic.
either he will give you antibiotic, or maybe do a minor surgery to discharge the white liquid puss from the nodes.

that white liquid puss with the bad, putric smell is actually comes together with your white blood cell.
Yes, in fact it's normal. any foreign virus/vaccine getting inside, your lymph node will auto swollen, indicating your body natural first line of defence is working. then after a while, it will subside.

If it not working, then immediately virus may infect your brain or lungs or heart, then it's game over.

Thank God for the lymph nodes! 

PS - i used to have swollen right armpit for years, on and off. Main suspect: bad batch of food that contain some damn strong virus.

it can be from as small as a 50 cent coin to a major, serious one -> size of a golf ball.