What term describes an excessive or erotic interest in oneself and one's physical appearance?

The term that describes an excessive or erotic interest in oneself and one's physical appearance is known as narcissism. This concept originates from Greek mythology, specifically the story of Narcissus, a young man who became infatuated with his own reflection. Narcissism not only includes a strong focus on one's looks but also involves a lack of empathy for others and an inflated sense of one's own importance. It is often associated with various psychological conditions, including narcissistic personality disorder.

In contrast, the other terms refer to different concepts. Egocentrism is the inability to differentiate one’s own perspective from that of others, focusing more on a limited view rather than an obsession with self-image. Altruism involves selfless concern for the well-being of others, which is the opposite of self-absorption. Hedonism places emphasis on the pursuit of pleasure and self-indulgence, but it does not specifically relate to an obsession with physical appearance. Thus, narcissism is the most accurate term for describing an excessive interest in oneself and one's looks.