This symptom has many possible causes, including mental health. Webformication is the sensation resembling that of small insects crawling on (or under) the skin, in the absence of actual insects. Webformication, a type of tactile hallucination, is the feeling of imaginary insects or spiders on the skin.

It is one specific form of a set of sensations known as. Tactile hallucination is the false perception of tactile sensory input that creates.