All are types of schizoaffective disorder except,

A. False belief that someone is following. This describes a persecutory delusion, a type of false, fixed belief where a person is convinced they are being watched, followed, or harmed despite no evidence. Delusions are thought disturbances, whereas illusions involve misinterpretations of sensory stimuli.

B. Misinterpretation of real experience. An illusion occurs when a person misperceives an actual external stimulus. For example, seeing a coat hanging in a dark room and mistaking it for a person. Unlike hallucinations, illusions are based on real sensory input that is distorted or misinterpreted.

C. Feeling things that are not there. This describes a tactile hallucination, where a person experiences false sensory perceptions of touch, such as bugs crawling on the skin. Tactile hallucinations are commonly seen in substance withdrawal (e.g., alcohol withdrawal, cocaine intoxication) and psychotic disorders.

D. Hearing voices that are not there. This describes an auditory hallucination, the most common type of hallucination in schizophrenia and other psychotic disorders. Unlike illusions, hallucinations occur without any external stimulus and are perceived as real by the affected individual.

A. Recurrent eye plucking. There is no recognized disorder specifically involving eye plucking. However, repetitive behaviors targeting the eyes may be seen in severe body-focused repetitive behaviors (BFRBs) or obsessive-compulsive disorder (OCD)-related conditions.

B. Recurrent lip biting. While some individuals engage in compulsive lip biting, this behavior is not classified under excoriation disorder but may be part of body-focused repetitive behaviors (BFRBs) or impulse control disorders.

C. Recurrent skin picking. Excoriation disorder (dermatillomania) is a mental health condition characterized by compulsive skin picking, leading to tissue damage, infections, and scarring. It is classified under obsessive-compulsive and related disorders (OCRDs) in the DSM-5 and is often associated with anxiety, stress, or perfectionism.

D. Recurrent hair pulling. Trichotillomania (hair-pulling disorder) is a separate condition from excoriation disorder, involving compulsive hair pulling that results in noticeable hair loss. It is also classified under obsessive-compulsive and related disorders in the DSM-5.