Which symptom is characteristic of Angioneurotic oedema?

The characteristic symptom of angioneurotic edema, also known as angioedema, is indeed puffiness around the eyes. This condition involves rapid swelling in the deeper layers of the skin, often manifesting in regions such as the face and specifically around the eyes, due to an accumulation of fluid. The puffiness around the eyes occurs because this area is particularly sensitive to swelling caused by the underlying mechanisms of angioedema, which can include allergic reactions or genetic factors.

While swelling in other areas, such as the throat, can occur in angioedema, the question specifically asks for a characteristic symptom, and puffiness around the eyes is often more readily associated with this condition in clinical observations. Other symptoms mentioned in the options, like pain in the jaw or bleeding gums, are not typical of angioedema and may suggest different conditions entirely.