Onychophagia

What is onychophagia?

Onychophagia is the clinical name for fingernail biting. It is a common stress-related or nervous habit in children and adults. It involves biting off the nail plate, and sometimes the soft tissues of the nail bed and the cuticle as well. Onychophagia is a type of onychotillomania, which includes the habit of picking or otherwise manipulating the nails - for example, habit-tic nail deformity.

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Source: dermnetnz.org