What term refers to a person who has an excessive or erotic interest in themselves and their physical appearance?

The term that describes a person with an excessive or erotic interest in themselves and their physical appearance is "narcissist." This term originates from the Greek myth of Narcissus, who fell in love with his own reflection in a pool of water. Psychologically, narcissism is characterized by self-centeredness and an inflated sense of importance.

In contrast, the other terms do not convey the same meaning. An altruist is someone who is selflessly concerned for the well-being of others, which is the opposite of self-centeredness. An empath is someone who is highly attuned to the feelings and emotions of others, indicating a focus outside of themselves rather than an exaggerated self-interest. A hedonist is someone who seeks pleasure as the highest good but does not necessarily possess the self-obsession implied by narcissism. Thus, "narcissist" is the most appropriate choice for this definition.