Final answer:
Psychogenic pruritus is an itch with a psychological origin, often triggered by stress or emotional factors. It is not caused by nerve damage, external stimuli on the skin, or systemic diseases.
Step-by-step explanation:
Psychogenic pruritus refers to an itch with a psychological origin. It is not caused by nerve damage or external stimuli on the skin, nor is it associated with systemic diseases. Rather, it is a result of mental health conditions such as anxiety, depression, or obsessive-compulsive disorder. This psychological itch can be triggered or worsened by stress or emotional factors.