How common is it for somebody to get ear swelling?

Varied reasons. It could be from allergies or an infection of the ear. It may be part of a more generalized allergic reaction which needs to be e slushed and treated. There can be an infected cyst of the ear lobe or a foreign body reaction to an eating or piercing.There is also a condition call chondrodermatitis where the cartilage is swollen and needs to. E treated with oral medications.