When a person reports being recognized by someone unfamiliar to them this may be considered as one of the signs of dissociative identity disorder.

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Dissociative identity disorder (DID) involves the presence of two or more distinct personality states, and individuals with DID may experience periods of amnesia for certain aspects of their lives or their different identities. One of the signs of DID is the feeling of being recognized by someone who is unfamiliar to the person, which can be indicative of a dissociative episode or the presence of one of the alternate identities.

When a Person Reports Being Recognized by Someone Unfamiliar to Them