Hi,Dear,Welcome with your query to HCM.
Studied your query in full depth of its details.Reviewed it in context of your health concerns.
Based On the facts,You should go to your doctor as You mostly seem to suffer from-furuculitis in the armpit.Accompanied runny nose and throat has reduced your immunity and your risk of getting armpit hair follicle from the circulating strep or staph organisms from the
throat infection.
This is how your armpit lump is related with your runny nose.
Treat it by antibiotics with anti-pyretics and painkillers-NSAIDs x 5 days time and this would go with armpit getting normal.
Don't be obsessed and paranoid about it being cancerous- as cancers are not tender or painful initially.
This reply would reduce your scare hope so.
This reply would help you to plan further treatment soon with your treating doctors.Best of Luck and early recovery.
Welcome any further query in this regard,which would be replied in next
session.
Good Day!!
Dr.Savaskar M.N.
Senior Surgical Specialist
M.S.Genl-CVTS