A raised dark red line behind my uvula in throat for last 3 weeks. thick smelly saliva in throat for 4 months. taking allegra (fexofenadine). what could the line be?

Allergies: A bad smell could be from a sinus infection. With the chronic allergies, you are a set up for that. I do not know what the dark red line would be, but you should consider seeing your doctor to be examined for a sinus infection. They can have a look and tell you more about the red line, too.

Could be a: Sinus infection . You might need antibiotics at this point and probably should see an ENT

You need: to have a ENT specialist to evaluate you. You could have a chronic peri tonsil abscess.. needs to be ruled out. Only cure incision and drainage.