Body Integrity Identity Disorder
Body Integrity Identity Disorder (BIID) is a term used to describe individuals who desire one or more digits or limbs to be amputated, as they believe these are not part of their “self”. It may be regarded as a form of reverse “phantom limb”.
The preoccupation is focussed not on a feeling of defectiveness but on the sufferers’ expectation that they would be much more comfortable if one or more limbs or digits were amputated. They do not believe (as in BDD) their limbs to be defective or ugly nor do they wish cosmetically to alter the limb.
BIID is more akin to a Gender Identity Disorder. BIID is not part of BDD.