A round face can be characterised by a wide hairline and fullness below the cheekbones. People with round faces are also known to have weak definition in their cheeks and chins.
The shape of your face is usually an inherited trait. However, round faces can also be caused by weight gain, in which extra fat is deposited on the sides of the face. Moon facies, or moon face, is a condition related to obesity, but can also be associated with Cushing’s syndrome or steroid treatment.