Thanks for posting your query.
With the available described symptoms, there appears to be possibility of acute upper respiratory tract
viral infection with superimposed bacterial infection
Lump feeling could be due to enlarged tonsils precipitated by persistent infection.
Swelling in legs and redness
appears to be separate issue with possibility of localized cellulitis
You should consult with internal medicine specialist and should go for thorough check up.
You should take complete antibiotic course, decongestants, mucolytics and anti inflammatory.
You should apply hot fomentation at affected knee for faster relief.
Avoid cold drinks and oily foods.
Perform gargles three times in day.
Dr. Mayank Bhargava