Acarophobia is an extreme and irrational fear of small bugs (lice, scabies, fleas, ticks, bedbugs, etc.) that are crawling on the skin and infesting home and furnishings. In extreme conditions people claim that they can feel these creatures crawling on their skin and are quite handicapped by these fears. Cognitive-behavioral therapy can help alleviate this fear. This is similar to formication, or delusional infestation, in that this sometimes involves a tactile hallucination, but formication differs in that it does not contain the element of extreme fear or phobia of insects.