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Lymph nodes are called policeman of the body as they contribute to body's immune system. So, usually they enlarge when they have to do extra work i.e during infections. Other causes can be various cancers like lymphoma, or nearby cancer.

In neck, there are chain of lymph nodes governing the various portal of entry like mouth and nose, and have been grouped in levels as per their location. Level 2 node constitute upper jugular groups. Their enlargement is considered significant when they are more than a centimeter.

In your case as you have told that you have got allergic rhinitis, this may be a cause of subcentimetric increment in size. Other possibilities may be dental caries, pharyngitis, laryngitis etc.

Don't worry this can be a normal body defense mechanism in chronic rhinitis.
Hopefully answered your query.

Best wishes.

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