1. The good news is that formication usually does eventually disappear on its own.

2. I've heard the incidence of formication during perimenopause described as "rare, " but I have also read that as many as 20 percent of all women experience it.

3. Formication also occurs in alcoholism and can be a symptom of drug toxicity, particularly from overuse of cocaine and amphetamines.

4. Subjective symptoms consist of pruritus (itching), sensations of heat (burning), cold (tingling), prickling, biting, formication, pain, and numbness.

5. The woman developed lightheadedness, dyspnoea, tongue numbness, muscle twitching and formication on the legs and back.