About Two And A Half Weeks Ago I Found Two

About two and a half weeks ago I found two lumps on the side of my neck. One is bigger than the other but both are pretty small. They seem to be larger at night and smaller during the day. I've been told that this could be because my allergies have been bothering me really bad at night. They are solid and hard, not painfulx and they are mobile. I've had a sore throat, but also a stuffy nose and watery eyes and everything else that comes with having allergies so I'm not sure that the sore throat is linked to the lumps. I'm a little worried about this and I'm not sure if I should see a doctor.