Which symptom may accompany rubella in children?

Rubella, also known as German measles, commonly presents with distinct symptoms, and one of the hallmark manifestations, particularly in children, is swollen lymph nodes. This is especially evident in the posterior auricular region, which is located just behind the ears. The lymphadenopathy usually occurs before the characteristic rash and indicates the body's immune response to the viral infection.

The other symptoms provided in the choices do not typically accompany rubella. For instance, a severe, persistent cough is more commonly associated with respiratory infections rather than rubella. Excessive itching is not a symptom of rubella; instead, it is more closely linked to conditions involving allergic reactions or other rashes. Blister formation on the palms is indicative of other viral infections, such as hand, foot, and mouth disease, and is not a common symptom of rubella. Thus, swollen lymph nodes behind the ears align perfectly with the clinical presentation of rubella in children.