The human earlobe is composed of tough areolar and adipose (fatty) connective tissue

Connective tissue

"Connective tissue" is a fibrous tissue. It is one of the four traditional classes of tissues . Connective Tissue is found throughout the body.In fact the whole framework of the skeleton and the different specialized connective tissues from the crown of the head to the toes determine the form of...

s, lacking the firmness and elasticity of the rest of the pinna. Since the earlobe does not contain cartilage

Cartilage

Cartilage is a flexible connective tissue found in many areas in the bodies of humans and other animals, including the joints between bones, the rib cage, the ear, the nose, the elbow, the knee, the ankle, the bronchial tubes and the intervertebral discs...

 it has a large blood

Blood

Blood is a specialized bodily fluid in animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells....

 supply and may help to warm the ears and maintain balance. However earlobes are not generally considered to have any major biological function. The earlobe contains many nerve endings, and for some people is an erogenous zone

Erogenous zone

An erogenous zone is an area of the human body that has heightened sensitivity, the stimulation of which may result in the production of erotic sensations or sexual excitement.People have erogenous zones all over their bodies, but which areas are more sensitive than others vary...

.
Earlobes average about 2 cm long, and elongate slightly with age.