Patients with Autism Spectrum Disorder present with a heterogeneous mix of features beyond the core symptoms of the disorder. These features can be emotional, cognitive or behavioral. Behavioral symptoms often include self-injury, and this may take the form of repetitive skin-picking. The prevalence of skin-picking disorder in Autism is unknown. Skin-picking may lead to significant medical and psychosocial complications.

State University of New York at Buffalo

While stereotypic movement disorder may be characterized by repetitive self-injurious behavior, onset is in the early developmental period. 
For example, individuals with the neurogenetic condition Prader-Willi syndrome may have early onset of skin picking, and their symptoms may meet criteria for stereotypic movement disorder. While tics in individuals with Tourette’s disorder may lead to self injury, the behavior is not tic-like in excoriation disorder. 

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