On identity delusions

[Eridan]

 It seems pretty standard to talk about psychosis related to external people or things, but I almost never see much talk about delusions or psychosis which affects the perception of oneself. I'm sure it must be more common than it is talked about, especially in the case of (fairly common) grandiose delusions. I wonder why it isn't as talked about, though, even in the psychosis community itself; I wonder if it's because delusions related to other people often seem more 'harmful' or externally destructive, because it could damage relationships with others or cause conflict, while identity delusions are only really harmful or conflicting for oneself.